Encipher apparatus for image and sound transmission

Abstract

The invention provides an audio-visual transmission and encrypting device, which comprises a playing mechanism and a video signal receiving mechanism, wherein the playing mechanism is capable of processing audio-visual signal, and is at least provided with a drive unit, a dynamic decryption unit and an application program unit which are connected with each other; and the video signal receiving mechanism is connected with the playing mechanism through a connecting interface, and is at least provided with a receiving and demodulating unit capable of receiving external audio-visual signals, and a dynamic encrypting unit connected with the receiving and demodulating unit; and the dynamic encrypting unit can receive a dynamic encrypting string of the drive unit, operate the dynamic encrypting string, encrypt the operated dynamic encrypting string with the audio-visual signal and transmit the encrypted dynamic encrypting string to the drive unit. Therefore, encryption data used in the communication process of the video signal receiving mechanism and the playing mechanism are not easy to decode, and video signal data during the transmission are effectively protected.

Description

Technical field: [0001] The invention relates to a video and audio transmission encryption device, in particular to a video and audio transmission encryption device that can make the encrypted data of a video receiving mechanism communicate with a playback mechanism not easy to be cracked, and achieve effective protection of the video data during transmission. Background technique: [0002] Due to the increasing importance of digital rights management (DRM), many data will be added with a confidentiality mechanism during the transmission process, and the current digital TV system is also required to add a confidentiality mechanism during the transmission of an external TV card to the computer. Prevent video and audio data from being skimmed during transmission; generally, the existing encryption device, as shown in FIG. 4, includes a playback mechanism 5 and a TV card 6 connected to the playback mechanism 5 through a transmission interface 7, wherein the playback mechanism 5 is c...

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned encryption device can encrypt the video and audio data by the encryption unit 62 when the TV card 6 transmits the video data to the playback mechanism 5, the encryption unit 62 must use hardware AES or DES, etc. in order to increase the difficulty of being cracked. Encryption IC, or use expensive high-speed CPU to do AES or DES encryption, in the process, if someone cracks the AES or DES KEY, or the AES, DES KEY is known, then the data can be recorded, and the encryption device After one encryption, it is directly transmitted to the drive unit 51 of the playback mechanism 5, so that the user can choose to store or play. There is no re-encryption action, so that the encrypted audio-visual data is easy to be cracked and recorded, so that the encryption The unit 62 cannot effectively protect the video data during transmission, causing the encryption unit 62 to be useless and unable to meet the needs of actual use.

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