Streaming media signal and method for using the streaming media signal in a secure digital communication system

Abstract

The present invention relates to a streaming media signal for secure digital communication. In some embodiments, the streaming media signal includes: an audio handshake signal and a video streaming media signal. The streaming media signal is used to transmit digital documents between computer workstations in a secure digital communication system. The audio handshake signal adopts a dual-tone multi-frequency (DTMF) signal. The video streaming media signal is composed of multiple digital streaming media. The secure digital communication device in the secure digital communication system forms a secure bridge and telecommunication security barrier between the intranet and the Internet. The digital documents are converted into video streaming media signals, wherein the video streaming media signals contain QR two-dimensional codes, still images, and video clips. The video streaming media signal is securely transmitted between computer workstations through the open Internet through the secure digital communication device 100 to avoid man-in-the-middle attacks and the introduction of various computer viruses.

Description

Technical Field

[0001] The present invention relates to safe and reliable Internet communication, and in particular to a streaming media signal with improved security and reliability, and a method for using the streaming media signal in a secure digital communication system. Background Art

[0002] PACS (Picture Archiving and Communication) is a medical imaging technology that is primarily used in medical institutions to securely store and digitally transmit electronic images and clinically relevant reports. Using PACS avoids the need to manually archive and store, retrieve and send sensitive information, films and reports. Instead, medical documents and images can be securely stored in offsite servers, and medical staff can use PACS software, computer workstations and mobile communication devices to securely generate and use these medical documents and images from anywhere in the world.

[0003] When still images, videos, and patient reports are transferred from computer workstations to PACS servers, security, reliability, and patient privacy are critical. In order to avoid Man-in-the-Middle attacks, ARP poisoning, and various Internet virus infections, certain security measures must be taken to securely transfer various digital documents such as intranet reports, medical diagnostic images, and videos over the open Internet without a direct physical connection through the telecommunications security barrier between the intranet and the Internet.

[0004] Therefore, to date, there are still unresolved safety issues in the industry to address the above-mentioned defects and shortcomings. Summary of the invention

[0005] In one aspect, the present invention relates to a streaming media signal for securely transmitting a group of digital documents in a secure digital communication system. In some embodiments, the streaming media signal includes: an audio handshake signal, and a video streaming media signal. The streaming media signal is used to transmit the group of digital documents between a first computer workstation and a second computer workstation in the secure digital communication system. The audio handshake signal uses a dual-tone multi-frequency (DTMF) signal. The video streaming media signal is composed of multiple digital streaming media.

[0006] In some embodiments, the dual-tone multi-frequency (DTMF) signal includes at least: an A tone with a combination of a low frequency of 697 Hz and a high frequency of 1633 Hz; a B tone with a combination of a low frequency of 770 Hz and a high frequency of 1633 Hz; a C tone with a combination of a low frequency of 852 Hz and a high frequency of 1633 Hz; and a D tone with a combination of a low frequency of 941 Hz and a high frequency of 1633 Hz.

[0007] In some embodiments, the A tone sent from the first computer workstation to the second computer workstation is a handshake signal used to indicate that the first computer workstation transmits a QR code to the second computer workstation. The B tone sent from the second computer workstation to the first computer workstation is used to confirm that the second computer workstation receives the QR code sent from the first computer workstation. The C tone sent from the first computer workstation to the second computer workstation is a handshake signal used to indicate that the first computer workstation transmits a video clip to the second computer workstation. The D tone sent from the second computer workstation to the first computer workstation is used to confirm that the second computer workstation receives the video clip sent from the first computer workstation.

[0008] In some embodiments, the digital streaming media includes: a plurality of still images; and a plurality of video clips. The plurality of still images include: one or more QR codes, and one or more color pictures.

[0009] In some embodiments, the digital documents include: first-category digital documents, second-category digital documents, third-category digital documents, and any combination of these digital documents. The first-category digital documents include: WORD documents, spreadsheet documents, slide presentation documents, PDF documents, and TEXT documents. The second-category digital documents include: still images, color pictures, and various two-dimensional design patterns, etc. The third-category digital documents include: one or more video clips.

[0010] In some embodiments, the digital document is encoded into a streaming signal by a streaming signal codec of a first secure digital communication device installed on a first computer workstation in the secure digital communication system, and transmitted to a streaming signal transceiver of a second secure digital communication device installed on a second computer workstation via the Internet by a streaming signal transceiver of the first secure digital communication device. The streaming signal transceiver of the second secure digital communication device transmits the received encoded streaming signal to the streaming signal codec of the second secure digital communication device, and the streaming signal codec of the second secure digital communication device decodes the encoded streaming signal and restores it into a digital document.

[0011] In some embodiments, the streaming signal codec of the first secure digital communication device encodes the first type of digital document into a streaming signal with an audio handshake signal and a QR two-dimensional code, and the streaming signal transceiver of the first secure digital communication device transmits the encoded streaming signal to the streaming signal transceiver of the second secure digital communication device via the Internet. The streaming signal transceiver of the second secure digital communication device transmits the received encoded streaming signal to the streaming signal codec of the second secure digital communication device, and the streaming signal codec of the second secure digital communication device decodes the streaming signal with the audio handshake signal and the QR two-dimensional code and restores it into the first type of digital document.

[0012] In some embodiments, the streaming signal codec of the first secure digital communication device encodes the second type of digital document into a streaming signal with an audio handshake signal and a color picture, and the streaming signal transceiver of the first secure digital communication device transmits the encoded streaming signal to the streaming signal transceiver of the second secure digital communication device via the Internet. The streaming signal transceiver of the second secure digital communication device transmits the received encoded streaming signal to the streaming signal codec of the second secure digital communication device, and the streaming signal codec of the second secure digital communication device decodes the streaming signal with the audio handshake signal and the color picture and restores it into the second type of digital document.

[0013] In some embodiments, the streaming signal codec of the first secure digital communication device encodes the third type of digital document into a streaming signal with an audio handshake signal and a video clip, and the streaming signal transceiver of the first secure digital communication device transmits the encoded streaming signal to the streaming signal transceiver of the second secure digital communication device via the Internet. The streaming signal transceiver of the second secure digital communication device transmits the received encoded streaming signal to the streaming signal codec of the second secure digital communication device, and the streaming signal codec of the second secure digital communication device decodes the streaming signal with the audio handshake signal and the video clip and restores it into the third type of digital document.

[0014] In another aspect, the present invention relates to a method for securely transmitting a digital document in a secure digital communication system. In certain embodiments, the method for securely transmitting a digital document in a secure digital communication system comprises:

[0015] A user installs a first secure digital communication device on a first computer workstation in a secure digital communication system, and installs a second secure digital communication device on a second computer workstation. The first secure digital communication device and the second secure digital communication device are both installed between an intranet and the Internet across a firewall. The first computer workstation also contains a set of digital documents sent to the second computer workstation;

[0016] The streaming signal codec of the first secure digital communication device encodes the group of digital documents into a streaming signal, wherein the streaming signal comprises an audio handshake signal and a video streaming signal;

[0017] The streaming signal codec of the first secure digital communication device transmits the encoded streaming signal to a streaming signal transceiver of the first secure digital communication device via an HDMI interface;

[0018] The streaming media signal transceiver of the first secure digital communication device transmits the encoded streaming media signal to the streaming media signal transceiver of the second secure digital communication device installed on the second computer workstation via the Internet;

[0019] The streaming media signal transceiver of the second secure digital communication device transmits the received encoded streaming media signal to the streaming media signal codec of the second secure digital communication device through an HDMI interface; and

[0020] The streaming media signal codec of the second secure digital communication device decodes the received encoded streaming media signal to restore the group of digital files, and stores the group of digital files in the second computer workstation.

[0021] In some embodiments, the streaming media signal includes: the audio handshake signal and the video streaming media signal. The streaming media signal transmits the group of digital documents between the first computer workstation and the second computer workstation in the secure digital communication system. The audio handshake signal uses a dual-tone multi-frequency (DTMF) signal. The video streaming media signal is composed of multiple digital streaming media.

[0022] In some embodiments, the dual-tone multi-frequency (DTMF) signal includes at least: an A tone with a combination of a low frequency of 697 Hz and a high frequency of 1633 Hz, a B tone with a combination of a low frequency of 770 Hz and a high frequency of 1633 Hz, a C tone with a combination of a low frequency of 852 Hz and a high frequency of 1633 Hz, and a D tone with a combination of a low frequency of 941 Hz and a high frequency of 1633 Hz.

[0023] In some embodiments, the A tone sent from the first computer workstation to the second computer workstation is a handshake signal used to indicate that the first computer workstation transmits a QR two-dimensional code to the second computer workstation; the B tone sent from the second computer workstation to the first computer workstation is used to confirm that the second computer workstation has received the QR two-dimensional code sent from the first computer workstation; the C tone sent from the first computer workstation to the second computer workstation is a handshake signal used to indicate that the first computer workstation transmits a video clip to the second computer workstation; and the D tone sent from the second computer workstation to the first computer workstation is used to confirm that the second computer workstation has received the video clip sent from the first computer workstation.

[0024] In some embodiments, the digital streaming media includes: a plurality of still images and a plurality of video clips. The plurality of still images include: one or more QR codes and one or more color pictures.

[0025] In some embodiments, the digital documents include: first-category digital documents, second-category digital documents, third-category digital documents, and any combination of these digital documents. The first-category digital documents include: WORD documents, spreadsheet documents, slide presentation documents, PDF documents, and TEXT documents. The second-category digital documents include: still images, color pictures, and various two-dimensional design patterns, etc. The third-category digital documents include: one or more video clips.

[0026] In some embodiments, the step of encoding the group of digital documents into a streaming signal includes: encoding a first type of digital document into a streaming signal with an audio handshake signal and a QR code; encoding a second type of digital document into a streaming signal with an audio handshake signal and a color picture; and encoding a third type of digital document into a streaming signal with an audio handshake signal and a video clip.

[0027] In some embodiments, the step of decoding the encoded streaming signal and restoring it into the group of digital documents includes: decoding and restoring the streaming signal with an audio handshake signal and a QR code into a first type of digital document; decoding and restoring the streaming signal with an audio handshake signal and a color picture into a second type of digital document; and decoding and restoring the streaming signal with an audio handshake signal and a video clip into a third type of digital document.

[0028] In some embodiments, transmitting a streaming signal between a streaming signal codec and a streaming signal transceiver in a secure digital communication device includes: transmitting an audio handshake signal in the streaming signal through an audio channel of the HDMI interface; and transmitting a video streaming signal in the streaming signal through a display data channel of the HDMI interface.

[0029] These and other aspects of the invention will become apparent from the following description of the preferred embodiment taken in conjunction with the following drawings, but changes and modifications in these and other aspects may be effected without departing from the spirit and scope of the novel concepts of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings illustrate one or more embodiments of the invention and together with the written description serve to explain the principles of the invention. Wherever possible, the same reference numerals are used throughout the drawings to represent the same or similar elements in different embodiments. The accompanying drawings do not limit the invention to the specific embodiments disclosed and described herein. The drawings are not necessarily drawn to scale, but emphasis is placed on clearly illustrating the principles of the invention, and in which:

[0031] Figure 1 A block diagram of a secure digital communication device is shown according to some embodiments of the present invention;

[0032] Figure 2 A block diagram of a streaming media signal codec in a secure digital communication device is shown according to some embodiments of the present invention;

[0033] Figure 3 According to some embodiments of the present invention, a point-to-point secure digital communication between two computer workstations using a secure digital communication device is shown;

[0034] Figure 4 According to some embodiments of the present invention, waveforms and time curves of audio handshake signals and video streaming signals in streaming media signals during streaming media signal transmission are shown;

[0035] Figure 5 Some embodiments according to the present invention show various frequency combinations of dual tone multi-frequency (DTMF) signals used for audio handshake signals;

[0036] Figure 6 According to some embodiments of the present invention, various tone usage and time relationships of audio handshake signals in transmitting QR codes and color pictures are shown;

[0037] Figure 7 Some embodiments of the present invention show the use and time relationship of various tones in the audio handshake signal for transmitting QR codes, color pictures and video clips;

[0038] Figure 8 An example of a text-based digital document is shown according to some embodiments of the present invention;

[0039] Fig. 9 According to some embodiments of the present invention, a Figure 8 The QR code is formed by encoding the digital document in;

[0040] Fig.10 An example of a digital document showing a color picture according to some embodiments of the present invention;

[0041] Fig.11 A block diagram of a secure digital communication system using a secure digital communication device is shown according to some embodiments of the present invention;

[0042] Fig.12 A block diagram of a secure image archiving and communication system using a secure digital communication device is shown according to certain embodiments of the present invention; and

[0043] Fig.13 A flow chart of a method for securely transmitting digital documents in a secure digital communication system 10 is shown according to some embodiments of the present invention. DETAILED DESCRIPTION

[0044] The present invention will now be described more fully below with reference to the accompanying drawings, in which exemplary embodiments of the present invention are shown. However, the present invention may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. Specifically, these embodiments are provided so that the present invention will be thorough and complete, and these embodiments will fully convey the scope of the present invention to those skilled in the art. Similar reference numerals refer to similar elements throughout.

[0045] It should be understood that when an element is referred to as being "on" another element, it can be directly on the other element or there can be intervening elements therebetween. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0046] It should be understood that although the terms first, second, third, etc. may be used herein to describe various elements, devices, regions, layers and / or parts, these elements, devices, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, device, region, layer or part from another element, device, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, device, region, layer or part discussed below may be referred to as the second element, device, region, layer or part.

[0047] The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are also intended to include plural forms. It should be further understood that when used herein, the terms "include" or "comprise" or "have" indicate the presence of stated features, regions, integers, steps, operations, elements and / or devices, but do not exclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, devices and / or groups thereof.

[0048] In addition, relative terms such as "lower" or "bottom", "upper" or "top", and "front" or "back" may be used herein to describe the relationship of one element to another element as shown in the drawings. It should be understood that relative terms are intended to cover different orientations of the device other than the orientation depicted in the drawings. For example, if the device in a drawing is turned over, then the element described as being on the "lower" side of the other elements will be oriented on the "upper" side of the other elements. Therefore, the exemplary term "lower" may cover both "lower" and "upper" orientations depending on the specific orientation of the drawing. Similarly, if the device in a drawing is turned over, then the element described as being "under" or "below" the other elements will be oriented "above" the other elements. Therefore, the exemplary term "under" or "below" may cover both upper and lower orientations.

[0049] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which the invention belongs. It will be further understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and the present invention, and will not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0050] As used in this specification, streaming protocols include:

[0051] RTSP: Real-time Streaming Protocol;

[0052] RTMP: Real-time messaging protocol;

[0053] webRTC: Internet Real-Time Communication;

[0054] HLC: HTTP real-time streaming;

[0055] LL-HLS: Low-latency HTTP live streaming;

[0056] DASH: Dynamically adapted streaming over HTTP; and

[0057] SRT: Secure Reliable Transfer protocol.

[0058] The above streaming protocols use TCP (Transport Control Protocol) and UDP (User Datagram Protocol) for Internet transmission. The TCP protocol is mainly used for point-to-point data flow, while UDP is mainly used for one-to-many point data flow.

[0059] As used herein, the term module may refer to or include an application specific integrated circuit (ASIC), an electronic circuit, a combinational logic circuit, a field programmable gate array (FPGA), a shared, dedicated or combined processor that executes code, and other suitable hardware components that provide the described functionality, or a combination of some or all of the above, such as in a single-chip computer system. The term module may also include various types of shared, dedicated or combined memory that stores processor executable instructions.

[0060] The term code as used herein may include software, firmware and / or microcode, and may refer to programs, routines, and various software functions, etc. The term "shared" used above means that a single or shared processor may be used to execute some or all of the code from multiple modules. In addition, some or all of the code from multiple modules may be stored by a single or shared memory. The term group used above means that a group of processors may be used to execute some or all of the code in a single module. In addition, some or all of the code in a single module may be stored using a group of memories.

[0061] In the following description, numerous specific details are provided to provide a thorough understanding of the present invention, but the present invention may also be implemented by using other methods than those described herein, so the present invention is not limited to the specific embodiments disclosed below.

[0062] The present invention will be more fully described herein with reference to the accompanying drawings, as embodiments of the invention are shown in the accompanying drawings. However, the present invention may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. On the contrary, providing these embodiments may make the present invention more comprehensive and complete and will fully convey the scope of the invention to those skilled in the art. Like numbers generally refer to like elements.

[0063] On the one hand, Figure 1 As shown, the present invention relates to a secure digital communication device 100. In some embodiments, the secure digital communication device 100 includes: a streaming signal codec 102, and a streaming signal transceiver 104. Figure 2 As shown, the streaming media signal codec 102 includes an audio codec 1023 and a video codec 1024. The audio codec 1023 includes: AAC, AAC-LC, HE-AAC+, v1&v2, MP3, Speex, Opus, and Vorbis. The video codec 1024 includes: H.264, H.265, VP8, and VP9. The streaming media protocol here uses TCP (Transport Control Protocol) and UDP (User Datagram Protocol) for Internet transmission. The TCP protocol is mainly used for point-to-point data streams, while UDP is mainly used for one-to-many point data streams.

[0064] In some embodiments, streaming media can be transmitted on the Internet using many streaming media transmission protocols, such as: RTSP (Real-time Streaming Protocol), RTMP (Real-time Messaging Protocol), webRTC (Internet Real-time Communication), HLC (HTTP Live Streaming Protocol), LL-HLS (Low Latency HTTP Live Streaming Protocol), DASH (Dynamic Adaptation over HTTP), and SRT (Secure Reliable Delivery Protocol) and the like.

[0065] like Figure 1 As shown, the streaming signal codec 102 includes a first interface 1021 and a second interface 1022. The first interface 1021 of the streaming signal codec 102 receives one or more digital documents 101 from the intranet 16, and these digital documents 101 are encoded by the streaming signal codec 102 to form a streaming signal 103. The second interface 1022 of the streaming signal codec 102 receives a streaming signal 103, and the streaming signal codec 102 decodes the received streaming signal 103 and restores the streaming signal 103 to one or more digital documents 101. The streaming signal transceiver 104 includes a first interface 1041 and a second interface 1042.

[0066] The first interface 1041 of the streaming signal transceiver 104 receives the streaming signal 103 from the second interface of the streaming signal codec 102, and transmits the streaming signal 103 to the Internet 18 through the second interface of the streaming signal transceiver 104. The second interface 1042 of the streaming signal transceiver 104 receives the streaming signal 103 from the Internet 18, and transmits the received streaming signal 103 to the streaming signal codec 102 through the first interface 1041 of the streaming signal transceiver 104.

[0067] In some embodiments, the secure digital communication device 100 is installed between an intranet 16 and the Internet 18 across a firewall 17 of a computer workstation to form a telecommunication security barrier between the intranet 16 and the Internet 18 .

[0068] In certain embodiments, such as Figure 3As shown, when the first interface 1021 of the streaming signal codec 102 of the first secure digital communication device 1001 installed on the first computer workstation 2001 receives a group of digital documents 101 from the intranet 16, the streaming signal codec 102 of the first secure digital communication device 1001 encodes the group of digital documents 101 into a streaming signal 103, and sends the encoded streaming signal 103 through its second interface 1022 via an HDMI interface 105 to the first interface 1041 of the streaming signal transceiver 104 of the first secure digital communication device 1001, and the streaming signal transceiver 104 of the first secure digital communication device 1001 transmits the encoded streaming signal 103 through the Internet 18 to the second interface 1042 of the streaming signal transceiver 104 of the second secure digital communication device 1002 installed on the second computer workstation 2002 through its second interface 1042.

[0069] In some embodiments, the streaming signal 103 includes an audio handshake signal 1031 and a video streaming signal 1032. The audio handshake signal 1031 coordinates and controls the transmission of the video streaming signal 1032, and the video streaming signal 1032 also includes one or more QR codes 10321, one or more color pictures 10322, and one or more video clips 10323.

[0070] In some embodiments, the group of digital documents 101 includes a WORD document, a spreadsheet document, a slide presentation document, a PDF document, a TEXT document, a still image, various video clips, and any combination of such documents.

[0071] In certain embodiments, such as Figure 1 and Figure 2 As shown, the group of digital documents 101 includes: a first type of digital document 1011, a second type of digital document 1012, a third type of digital document 1013, and any combination of these digital documents. The first type of digital document 1011 includes: a WORD document, a spreadsheet document, a slide presentation document, a PDF document, a TEXT document, etc. Figure 8 A text-based exemplary digital document is shown, which is an application form for ultrasonic examination, and this digital document is used as an example of the first type of digital document 1011. The second type of digital document 1012 includes: still images, color images, and two-dimensional design patterns. Fig.10A typical ultrasound image of ultrasound examination is shown as an example of the second type of digital document 1012. The third digital content 1013 includes: one or more video clips (which cannot be shown in the drawings). One or more color pictures (the second type of digital document 1012) can also be included in the video clips as a special case of video clips.

[0072] In some embodiments, the streaming signal codec 102 of the first secure digital communication device 1001 performs the following functions: (1) encodes the first type of digital document 1011 into a streaming signal 103 with an audio handshake signal 1031 and a QR code 10321; (2) encodes the second type of digital document 1012 into a streaming signal 103 with an audio handshake signal 1031 and a color image 10322; and (3) encodes the third type of digital document 1013 into a streaming signal 103 with an audio handshake signal 1031 and a video segment 10323. The streaming signal transceiver 104 of the first secure digital communication device 1001 of the first computer workstation 2001 transmits the encoded streaming signal 103 to the streaming signal transceiver 104 of the second secure digital communication device 1002 of the second computer workstation 2002 via the Internet 18.

[0073] In some embodiments, when the second interface 1042 of the streaming signal transceiver 104 of the second secure digital communication device 1002 of the second computer workstation 2002 receives the encoded streaming signal 103, the streaming signal transceiver 104 of the second secure digital communication device 1002 sends the encoded streaming signal 103 to the second interface 1022 of the streaming signal codec 102 of the second secure digital communication device 1002 through its first interface 1041 via an HDMI interface 105, and the streaming signal codec 102 of the second secure digital communication device 1002 decodes the received encoded streaming signal 103 and restores it to the group of digital documents 101, and stores the decoded digital documents 101 in the second computer workstation 2002.

[0074] In some embodiments, the secure digital communication device 100 further includes an HDMI interface 105 between the second interface 1022 of the streaming signal codec 102 and the first interface 1041 of the streaming signal transceiver 104 in each secure digital communication device 100. The streaming signal 103 is transmitted through the HDMI interface 105, the audio handshake signal 1031 of the streaming signal 103 is transmitted through an audio channel of the HDMI interface 105, and the video streaming signal 1032 of the streaming signal 103 is transmitted through a display data channel of the HDMI interface 105.

[0075] In another aspect, the present invention relates to a streaming media signal 103 for securely transmitting a set of digital documents 101 in a secure digital communication system 10. In some embodiments, such as Figure 4 As shown, the streaming media signal 103 includes: an audio handshake signal 1031, and a video streaming media signal 1032. The streaming media signal 103 is used to transmit the group of digital files 101 between two computer workstations in the secure digital communication system 10. The audio handshake signal 1031 adopts a dual-tone multi-frequency (DTMF) signal. The video streaming media signal 1032 is composed of multiple digital streaming media. The audio handshake signal 1031 coordinates the transmission of the video streaming media signal 1032. The video streaming media signal 1032 in the streaming media signal 103 includes Figure 1 The displayed QR code is 10321. Fig.10 A color image 10322 is displayed, as well as one or more video segments 10323 (not shown).

[0076] In certain embodiments, such as Figure 5 As shown, the dual-tone multi-frequency (DTMF) signal at least includes: an A tone with a combination of a low frequency of 697 Hz and a high frequency of 1633 Hz; a B tone with a combination of a low frequency of 770 Hz and a high frequency of 1633 Hz; a C tone with a combination of a low frequency of 852 Hz and a high frequency of 1633 Hz; and a D tone with a combination of a low frequency of 941 Hz and a high frequency of 1633 Hz.

[0077] In certain embodiments, such as Figure 4 As shown, when the audio handshake signal 1031 changes from a high voltage to a low voltage at time T11, the streaming media signal transceiver 104 of the first secure digital communication device 1001 of the first computer workstation 2001 transmits the video streaming signal 1032 (the first image) to the second interface 1042 of the streaming media signal transceiver 1042 of the second secure digital communication device 1002 of the second computer workstation 2002 through the Internet 18 via its second interface 1042. When the video streaming signal 1032 (the first image) is transmitted completely at time T12, the streaming media signal transceiver 1042 of the second secure digital communication device 1002 of the second computer workstation 2002 sends a confirmation message to the streaming media signal transceiver 1042 of the first secure digital communication device 1002 of the first computer workstation 2001, that is, the audio handshake signal 1031 changes from a low voltage to a high voltage at time T12.

[0078] When the audio handshake signal 1031 changes from a high voltage to a low voltage at time T21, the streaming media signal transceiver 104 of the first secure digital communication device 1001 of the first computer workstation 2001 transmits the video streaming media signal 1032 (the second image) to the second interface 1042 of the streaming media signal transceiver 1042 of the second secure digital communication device 1002 of the second computer workstation 2002 through the Internet 18 via its second interface 1042. When the video streaming media signal 1032 (the second image) is completely transmitted at time T22, the streaming media signal transceiver 1042 of the second secure digital communication device 1002 of the second computer workstation 2002 sends a confirmation message to the streaming media signal transceiver 1042 of the first secure digital communication device 1002 of the first computer workstation 2001, that is, the audio handshake signal 1031 changes from a low voltage to a high voltage at time T22.

[0079] In certain embodiments, such as Figure 6 As shown, the A tone sent from the first computer workstation 2001 to the second computer workstation 2002 at time T1 and T3 is a handshake signal used to indicate that the first computer workstation 2001 transmits a QR two-dimensional code to the second computer workstation 2002. The B tone sent from the second computer workstation 2002 to the first computer workstation 2001 at time T2 and T4 is used to confirm that the second computer workstation 2002 receives the QR two-dimensional code sent by the first computer workstation 2001. The C tone sent from the first computer workstation 2001 to the second computer workstation 2002 at time T5 and T7 is a handshake signal used to indicate that the first computer workstation 2001 transmits a video clip to the second computer workstation 2002. The D tone sent from the second computer workstation 2002 to the first computer workstation 2001 at time T6 and T8 is used to confirm that the second computer workstation 2002 receives the video clip sent by the first computer workstation 2001.

[0080] In some embodiments, the video clip may also include one or more color images. Therefore, the audio handshake signal 1031 of the streaming media signal 103 uses C and D tones to coordinate the transmission of the second type of digital file 1012 and the third type of digital file 1013.

[0081] like Figure 7As shown, the A tone sent from the second computer workstation 2002 to the first computer workstation 2001 at time T1 and T3 is a handshake signal for the second computer workstation 2002 to transmit a QR two-dimensional code to the first computer workstation 2001. The B tone sent from the first computer workstation 2001 to the second computer workstation 2002 at time T2 and T4 is used to confirm that the first computer workstation 2001 has received the QR two-dimensional code sent by the second computer workstation 2002. The C tone sent from the second computer workstation 2002 to the first computer workstation 2001 at time T5 and T7 is a handshake signal for the second computer workstation 2002 to transmit a video clip to the first computer workstation 2001. The D tone sent from the first computer workstation 2001 to the second computer workstation 2002 at time T6 and T8 is used to confirm that the first computer workstation 2001 has received the video clip sent by the second computer workstation 2002.

[0082] In some embodiments, in some private networks (such as the intranet 16), actual connections such as CAT-5 cable connectors and USB interface connectors are not allowed between the private network and the open Internet. The secure digital communication device 100 forms a secure bridge and telecommunication security barrier between the intranet 16 and the Internet 18, and the digital document 101 is converted into a QR code and transmitted through the secure digital communication device 100 to avoid MITM attacks and the introduction of various computer viruses.

[0083] In some embodiments, the digital file 101 is encoded into a streaming signal 103 by a streaming signal codec 102 of a first secure digital communication device 1001 installed on a first computer workstation 2001 in the secure digital communication system 10, and is transmitted to a streaming signal transceiver 104 of a second secure digital communication device 1002 installed on a second computer workstation 2002 via the Internet 18 by a streaming signal transceiver 104 of the first secure digital communication device 1001. The streaming signal transceiver 104 of the second secure digital communication device 1002 transmits the received encoded streaming signal 103 to the streaming signal codec 102 of the second secure digital communication device 1002, and the streaming signal codec 102 of the second secure digital communication device 1002 decodes the encoded streaming signal 103 and restores it to the digital file 101.

[0084] In some embodiments, the streaming signal codec 102 of the first secure digital communication device 1001 encodes the first type digital document 1011 into a streaming signal 103 with an audio handshake signal 1031 and a QR two-dimensional code 10321, and the streaming signal transceiver 104 of the first secure digital communication device 1001 transmits the encoded streaming signal 103 to the streaming signal transceiver 104 of the second secure digital communication device 1002 via the Internet 18. The streaming signal transceiver 104 of the second secure digital communication device 1002 transmits the received encoded streaming signal 103 to the streaming signal codec 102 of the second secure digital communication device 1002, and the streaming signal codec 102 of the second secure digital communication device 1002 decodes the streaming signal 103 with the audio handshake signal 1031 and the QR two-dimensional code 10321 and restores it to the first type digital document 1011.

[0085] In some embodiments, the streaming signal codec 102 of the first secure digital communication device 1001 encodes the second type digital document 1012 into a streaming signal 103 with an audio handshake signal 1031 and a color picture 10322, and the streaming signal transceiver 104 of the first secure digital communication device 1001 transmits the encoded streaming signal 103 to the streaming signal transceiver 104 of the second secure digital communication device 1002 via the Internet 18. The streaming signal transceiver 104 of the second secure digital communication device 1002 transmits the received encoded streaming signal 103 to the streaming signal codec 102 of the second secure digital communication device 1002, and the streaming signal codec 102 of the second secure digital communication device 1002 decodes the streaming signal 103 with the audio handshake signal 1031 and the color picture 10322 and restores it into the second type digital document 1012.

[0086] In some embodiments, the streaming signal codec 102 of the first secure digital communication device 1001 encodes the third type digital document 1013 into a streaming signal 103 with an audio handshake signal 1031 and a video segment 10323, and the streaming signal transceiver 104 of the first secure digital communication device 1001 transmits the encoded streaming signal 103 to the streaming signal transceiver 104 of the second secure digital communication device 1002 via the Internet 18. The streaming signal transceiver 104 of the second secure digital communication device 1002 transmits the received encoded streaming signal 103 to the streaming signal codec 102 of the second secure digital communication device 1002, and the streaming signal codec 102 of the second secure digital communication device 1002 decodes the streaming signal 103 with the audio handshake signal 1031 and the video segment 10323 and restores it into the third type digital document 1013.

[0087] In some embodiments, in some private networks (such as the intranet 16), actual connections such as CAT-5 cable connectors and USB interface connectors are not allowed between the private network and the open Internet. The secure digital communication device 100 forms a secure bridge and telecommunication security barrier between the intranet 16 and the Internet 18, and the digital document 101 is converted into a QR code and transmitted through the secure digital communication device 100 to avoid MITM attacks and the introduction of various computer viruses.

[0088] In another aspect, the present invention relates to a secure digital communication system 10. In some embodiments, such as Fig.11 As shown, the secure digital communication system 10 includes: a secure digital communication system server 12, a group of computer workstations 200 installed in an intranet 16, and a group of secure digital communication devices 100. The secure digital communication system server 12 is connected to a database 14 and a server secure digital communication device 1000. The group of computer workstations 200 are connected to the secure digital communication system server 12 through the Internet 18. Each secure digital communication device 100 connects a corresponding computer workstation 200 to the secure digital communication system server 12 through the server secure digital communication device 1000, so as to ensure the communication security between each computer workstation 200 and the secure digital communication system server 12.

[0089] In some embodiments, each secure digital communication device 100 and the server secure digital communication device 1000 include: a streaming signal codec 102, and a streaming signal transceiver 104. The streaming signal codec 102 includes a first interface 1021 and a second interface 1022. The streaming signal transceiver 104 also includes a first interface 1041 and a second interface 1042. The secure digital communication device 100 is installed between an intranet 16 and the Internet 18 across a firewall 17 of a computer workstation to form a telecommunication security barrier between the intranet 16 and the Internet 18.

[0090] In some embodiments, when the first interface 1021 of the streaming signal codec 102 of the first secure digital communication device 1001 installed on the first computer workstation 2001 receives a group of digital documents 101 from the intranet 16, the streaming signal codec 102 of the first secure digital communication device 1001 encodes the group of digital documents 101 into a streaming signal 103, and sends the encoded streaming signal 103 through its second interface 1022 via an HDMI interface 105 to the first interface 1041 of the streaming signal transceiver 104 of the first secure digital communication device 1001, and the streaming signal transceiver 104 of the first secure digital communication device 1001 sends the encoded streaming signal 103 through its second interface 1042 to the second interface 1042 of the streaming signal transceiver 104 of the second secure digital communication device 1002 installed on the second computer workstation 2002 via the Internet 18.

[0091] In some embodiments, when the second interface 1042 of the streaming signal transceiver 104 of the second secure digital communication device 1002 receives the encoded streaming signal 103, the streaming signal transceiver 104 of the second secure digital communication device 1002 sends the encoded streaming signal 103 to the second interface 1022 of the streaming signal codec 102 of the second secure digital communication device 1002 through its first interface 1041 via an HDMI interface 105, and the streaming signal codec 102 of the second secure digital communication device 1002 decodes the received encoded streaming signal 103 and restores it to the group of digital documents 101, and stores the decoded digital documents 101 in the second computer workstation 2002.

[0092] In some embodiments, streaming media can be transmitted on the Internet using many streaming media transmission protocols, such as: RTSP (Real-time Streaming Protocol), RTMP (Real-time Messaging Protocol), webRTC (Internet Real-time Communication), HLC (HTTP Live Streaming Protocol), LL-HLS (Low Latency HTTP Live Streaming Protocol), DASH (Dynamic Adaptation over HTTP), and SRT (Secure Reliable Delivery Protocol) and the like.

[0093] In some embodiments, the group of digital documents 101 includes a WORD document, a spreadsheet document, a slide presentation document, a PDF document, a TEXT document, a still image, various video clips, and any combination of such documents.

[0094] In some embodiments, the streaming signal 103 includes an audio handshake signal 1031 and a video streaming signal 1032. The audio handshake signal 1031 coordinates and controls the transmission of the video streaming signal 1032. The video streaming signal 1032 also includes one or more QR codes 10321, one or more color pictures 10322, and one or more video clips 10323.

[0095] In some embodiments, the secure digital communication device 100 further includes an HDMI interface 105 between the second interface 1022 of the streaming signal codec 102 and the first interface 1041 of the streaming signal transceiver 104 in the secure digital communication device 100. The streaming signal 103 is transmitted through the HDMI interface 105, the audio handshake signal 1031 of the streaming signal 103 is transmitted through an audio channel of the HDMI interface 105, and the video streaming signal 1032 of the streaming signal 103 is transmitted through a display data channel of the HDMI interface 105.

[0096] In yet another aspect, the present invention relates to a secure picture archiving and communication system (PACS) 20. In certain embodiments, such as Fig.12 As shown, the secure image archiving and communication system 20 includes: a secure PACS server 22, a group of PACS computer workstations 300 installed in the intranet 16, and a group of secure digital communication devices 100. The secure PACS server 22 is connected to a PACS database 24 and a server secure digital communication device 1000. The group of PACS computer workstations 300 are all connected to the secure PACS server 22 through the Internet 18. For example, the first secure digital communication device 1001 is connected to the first PACS computer workstation 3001, the second secure digital communication device 1002 is connected to the second PACS computer workstation 3002, ..., the Nth secure digital communication device 100N is connected to the Nth PACS computer workstation 300N. Each secure digital communication device 100 connects a corresponding PACS computer workstation 300 to the secure PACS server 22 through the server secure digital communication device 1000, so as to ensure the communication security between each PACS computer workstation 300 and the secure PACS server 22.

[0097] In some embodiments, each secure digital communication device 100 and the server secure digital communication device 1000 include: a streaming signal codec 102, and a streaming signal transceiver 104. The streaming signal codec 102 includes a first interface 1021 and a second interface 1022. The streaming signal transceiver 104 also includes a first interface 1041 and a second interface 1042. The secure digital communication device 100 is installed between the intranet 16 and the Internet 18 across a firewall 17 of a PACS computer workstation to form a telecommunication security barrier between the intranet 16 and the Internet 18.

[0098] In some embodiments, when the first interface 1021 of the streaming signal codec 102 of the first secure digital communication device 1001 installed in the first PACS computer workstation 3001 receives a group of PACS documents 101 from the intranet 16, the streaming signal codec 102 of the first secure digital communication device 1001 encodes the group of PACS documents 101 into a streaming signal 103, and sends the encoded streaming signal 103 to the first interface 1041 of the streaming signal transceiver 104 of the first secure digital communication device 1001 through its second interface 1022, and the streaming signal transceiver 104 of the first secure digital communication device 1001 sends the encoded streaming signal 103 to the second interface 1042 of the streaming signal transceiver 104 of the second secure digital communication device 1002 installed in the second PACS computer workstation 3002 through the Internet 18 through its second interface 1042.

[0099] In some embodiments, when the second interface 1042 of the streaming signal transceiver 104 of the second secure digital communication device 1002 receives the encoded streaming signal 103, the streaming signal transceiver 104 of the second secure digital communication device 1002 sends the encoded streaming signal 103 to the second interface 1022 of the streaming signal codec 102 of the second secure digital communication device 1002 through its first interface 1041, and the streaming signal codec 102 of the second secure digital communication device 1002 decodes the received encoded streaming signal 103 and restores it to the group of PACS documents 101, and stores the decoded PACS documents 101 on the second PACS computer workstation 3002.

[0100] In some embodiments, the group of PACS digital documents 101 includes a WORD document, a spreadsheet document, a slide presentation document, a PDF document, a TEXT document, a still image, various video clips, and any combination of such documents.

[0101] In some embodiments, the streaming signal 103 includes an audio handshake signal 1031 and a video streaming signal 1032. The audio handshake signal 1031 coordinates and controls the transmission of the video streaming signal 1032. The video streaming signal 1032 also includes one or more QR codes 10321, one or more color pictures 10322, and one or more video clips 10323.

[0102] In some embodiments, the secure digital communication device 100 further includes an HDMI interface 105 between the second interface 1022 of the streaming signal codec 102 and the first interface 1041 of the streaming signal transceiver 104 in the secure digital communication device 100. The streaming signal 103 is transmitted through the HDMI interface 105, the audio handshake signal 1031 of the streaming signal 103 is transmitted through an audio channel of the HDMI interface 105, and the video streaming signal 1032 of the streaming signal 103 is transmitted through a display data channel of the HDMI interface 105.

[0103] In yet another aspect, the present invention relates to a method for securely transmitting digital documents in a secure digital communication system 10. In some embodiments, Fig.13 A flowchart 1300 of a method for securely transmitting digital documents in a secure digital communication system 10 is shown according to some embodiments of the present invention:

[0104] At block 1302: a user installs a first secure digital communication device 1001 on a first computer workstation 2001 in a secure digital communication system 10, and installs a second secure digital communication device 1002 on a second computer workstation 2002. The first secure digital communication device 1001 and the second secure digital communication device 1002 are both installed between an intranet 16 and the Internet 18 across a firewall 17. The first computer workstation 2001 also contains a set of digital documents 101 sent to the second computer workstation 2002;

[0105] At block 1304: the streaming signal codec 102 of the first secure digital communication device 1001 encodes the set of digital files 101 into a streaming signal 103, wherein the streaming signal 103 comprises an audio handshake signal 1031 and a video streaming signal 1032;

[0106] At block 1306: the streaming signal codec 102 of the first secure digital communication device 1001 transmits the encoded streaming signal 103 to a streaming signal transceiver 104 of the first secure digital communication device 1001 via an HDMI interface 105;

[0107] At block 1308: the streaming media signal transceiver 104 of the first secure digital communication device 1001 transmits the encoded streaming media signal 103 to the streaming media signal transceiver 104 of the second secure digital communication device 1002 installed on the second computer workstation 2002 via the Internet 18;

[0108] At block 1310 : the streaming signal transceiver 104 of the second secure digital communication device 1002 transmits the received encoded streaming signal 103 to the streaming signal codec 102 of the second secure digital communication device 1002 via an HDMI interface 105 ;

[0109] At block 1312: the streaming signal codec 102 of the second secure digital communication device 1002 decodes the received encoded streaming signal 103 to restore the set of digital files 101;

[0110] In block 1314 : the streaming signal codec 102 of the second secure digital communication device 1002 stores the decoded and restored set of digital files 101 on the second computer workstation 2002 .

[0111] In some embodiments, the streaming media signal 103 includes: the audio handshake signal 1031 and the video streaming media signal 1032. The streaming media signal 103 transmits the group of digital documents 101 between the first computer workstation 2001 and the second computer workstation 2002 in the secure digital communication system 10. The audio handshake signal 1031 uses a dual-tone multi-frequency (DTMF) signal. The video streaming media signal 1032 is composed of multiple digital streaming media.

[0112] In some embodiments, the dual-tone multi-frequency (DTMF) signal includes at least: an A tone with a combination of a low frequency of 697 Hz and a high frequency of 1633 Hz, a B tone with a combination of a low frequency of 770 Hz and a high frequency of 1633 Hz, a C tone with a combination of a low frequency of 852 Hz and a high frequency of 1633 Hz, and a D tone with a combination of a low frequency of 941 Hz and a high frequency of 1633 Hz.

[0113] In some embodiments, the A tone sent from the first computer workstation 2001 to the second computer workstation 2002 is a handshake signal used to indicate that the first computer workstation 2001 transmits a QR two-dimensional code to the second computer workstation 2002; the B tone sent from the second computer workstation 2002 to the first computer workstation 2001 is used to confirm that the second computer workstation 2002 receives the QR two-dimensional code sent by the first computer workstation 2001; the C tone sent from the first computer workstation 2001 to the second computer workstation 2002 is a handshake signal used to indicate that the first computer workstation 2001 transmits a video clip to the second computer workstation 2002; and the D tone sent from the second computer workstation 2002 to the first computer workstation 2001 is used to confirm that the second computer workstation 2002 receives the video clip sent by the first computer workstation 2001.

[0114] In some embodiments, the digital streaming media includes: a plurality of still images and a plurality of video clips. The plurality of still images include: one or more QR codes and one or more color pictures.

[0115] In some embodiments, the digital document 101 includes: a first type of digital document 1011, a second type of digital document 1012, a third type of digital document 1013, and any combination of these digital documents. The first type of digital document 1011 includes: a WORD document, a spreadsheet document, a slide presentation document, a PDF document, and a TEXT document. The second type of digital document 1012 includes: a still image, a color picture, and various two-dimensional design patterns, etc. The third type of digital document 1013 includes: one or more video clips.

[0116] In some embodiments, the step of encoding the group of digital documents 101 into a streaming signal 103 includes: encoding a first type of digital document 1011 into a streaming signal 103 with an audio handshake signal 1031 and a QR code 10321; encoding a second type of digital document 1012 into a streaming signal 103 with an audio handshake signal 1031 and a color picture 10322; and encoding a third type of digital document 1013 into a streaming signal 103 with an audio handshake signal 1031 and a video clip 10323.

[0117] In some embodiments, the step of decoding and restoring the encoded streaming signal 103 into the group of digital documents 101 includes: decoding and restoring the streaming signal 103 with the audio handshake signal 1031 and the QR code 10321 into a first type of digital document 1011; decoding and restoring the streaming signal 103 with the audio handshake signal 1031 and the color picture 10322 into a second type of digital document 1012; and decoding and restoring the streaming signal 103 with the audio handshake signal 1031 and the video clip 10323 into a third type of digital document 1013.

[0118] In some embodiments, transmitting the streaming signal 103 between the streaming signal codec 102 and the streaming signal transceiver 104 in the secure digital communication device 100 includes: transmitting the audio handshake signal 1031 in the streaming signal 103 through an audio channel of the HDMI interface 105; and transmitting the video streaming signal 1032 in the streaming signal 103 through a display data channel of the HDMI interface 105.

[0119] The above description of various exemplary embodiments of the present invention is only used to demonstrate and state part of the present invention, and the above description does not represent exhaustiveness, nor can it limit the present invention to the specific or precise form disclosed. Based on the above description and demonstration, many modifications and changes are entirely possible. The selected and described embodiments are used to explain the principles of the present invention and its practical application, so that technicians in the field can use the present invention and various embodiments and with various modifications suitable for the intended specific use. Without departing from the spirit and scope of the present invention, technicians in the field to which the present invention relates will be aware of alternative embodiments. Therefore, the scope of the present invention is defined by the appended claims, the foregoing description and the exemplary embodiments described therein and the accompanying drawings.

Claims

1. A method for securely transmitting digital documents in a secure digital communication system, comprising: A user installs a first secure digital communication device on a first computer workstation in a secure digital communication system, and installs a second secure digital communication device on a second computer workstation, wherein the first secure digital communication device and the second secure digital communication device are both installed between an intranet and the Internet across a firewall to form a telecommunication security barrier between the intranet and the Internet, wherein the first computer workstation contains a set of digital documents sent to the second computer workstation; The streaming signal codec of the first secure digital communication device encodes the group of digital documents into a streaming signal, wherein the streaming signal comprises an audio handshake signal and a video streaming signal, the audio handshake signal is used to coordinate the transmission of the video streaming signal, and the video streaming signal is used to transmit the digital documents between the first computer workstation and the second computer workstation; The streaming signal codec of the first secure digital communication device transmits the encoded streaming signal to a streaming signal transceiver of the first secure digital communication device via an HDMI interface; The streaming signal transceiver of the first secure digital communication device transmits the encoded streaming signal to a streaming signal transceiver of the second secure digital communication device installed on the second computer workstation via the Internet; The streaming media signal transceiver of the second secure digital communication device transmits the received encoded streaming media signal to the streaming media signal codec of the second secure digital communication device via an HDMI interface; and The streaming media signal codec of the second secure digital communication device decodes the received encoded streaming media signal to restore the set of digital files, and stores the set of digital files on the second computer workstation; The streaming media signal includes: The audio handshake signal, and The video streaming signal, wherein the streaming media signal transmits the set of digital documents between a first computer workstation and a second computer workstation in a secure digital communication system, the audio handshake signal uses a dual-tone multi-frequency (DTMF) signal, and the video streaming media signal is composed of a plurality of digital streaming media; The video streaming signal further includes one or more QR codes, one or more color pictures, and one or more video clips; The digital documents include: The first category of digital documents includes: WORD documents, electronic spreadsheet documents, slide presentation documents, PDF documents, and TEXT documents; The second category of digital documents includes: still images, color pictures, and various two-dimensional design patterns; The third type of digital document, wherein the third type of digital document comprises: one or more video clips; and Any combination of the above types of digital documents; The step of encoding the set of digital documents into a streaming media signal comprises: Encoding the first type of digital document into a streaming signal with an audio handshake signal and a QR code; encoding the second type of digital document into a streaming signal with an audio handshake signal and a color picture; as well as Encodes Category 3 digital files into streaming signals with audio handshake signals and video clips.

2. The method according to claim 1, wherein the dual tone multi-frequency (DTMF) signal at least comprises: an A key with a low frequency of 697 Hz and a high frequency of 1633 Hz; a B key with a low frequency of 770 Hz and a high frequency of 1633 Hz; A C note with a low frequency of 852 Hz and a high frequency of 1633 Hz; and A D key with a low frequency of 941 Hz and a high frequency of 1633 Hz.

3. The method according to claim 2, wherein the A tone sent from the first computer workstation to the second computer workstation is a handshake signal used to indicate that the first computer workstation transmits a QR two-dimensional code to the second computer workstation; The B tone sent from the second computer workstation to the first computer workstation is used to confirm that the second computer workstation has received the QR code sent by the first computer workstation; The C tone sent from the first computer workstation to the second computer workstation is a handshake signal used to indicate that the first computer workstation is transmitting a video clip to the second computer workstation; and The D tone sent from the second computer workstation to the first computer workstation is used to confirm that the second computer workstation has received the video clip sent by the first computer workstation.

4. The method according to claim 1, wherein the digital streaming media comprises: a plurality of still images; and Multiple video clips.

5. The method of claim 4, wherein the plurality of still images comprises: One or more QR codes; and One or more color images.

6. The method according to claim 1, wherein the step of decoding the encoded streaming media signal back into the set of digital files comprises: Decode the streaming media signal with the audio handshake signal and the QR code and restore it into the first type of digital document; Decoding the streaming media signal with audio handshake signal and color picture back into a second type digital file; and Decode the streaming media signal with audio handshake signal and video clips and restore it into a third-type digital file.

7. The method according to claim 6, wherein transmitting the streaming media signal between the streaming media signal codec and the streaming media signal transceiver in the secure digital communication device comprises: Transmitting an audio handshake signal in the streaming media signal through an audio channel of the HDMI interface; as well as The video streaming signal in the streaming signal is transmitted through a display data channel of the HDMI interface.

Images