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Encryption device, decryption device, license issuing device, and content data generation method

A technology for encrypting device and content data, which is applied in secure communication device, selective content distribution and key distribution, which can solve problems such as decryption error and inconsistent state of data stream encryption algorithm

Inactive Publication Date: 2013-06-05
KDDI CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, in digital broadcasting, due to a transmission error of the broadcast data, etc., if the transmission packet storing the stream encrypted data is lost, the states of the stream encryption algorithms of the encryption device and the decryption device become inconsistent, and decryption occurs. mistake

Method used

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  • Encryption device, decryption device, license issuing device, and content data generation method
  • Encryption device, decryption device, license issuing device, and content data generation method
  • Encryption device, decryption device, license issuing device, and content data generation method

Examples

Experimental program
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Embodiment approach 1

[0075] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0076] figure 1 It is a block diagram showing the configuration of a broadcasting system according to an embodiment of the present invention. exist figure 1 Among them, the broadcasting station 1 has an encryption device 100 . The encryption device 100 encrypts content provided by broadcast waves. The license-issuing device 2 supplies a license for decrypting encrypted content provided in broadcast waves from the broadcasting station 1 through a communication line. The terminal device 3 has a decryption device 300 . The decryption device 300 decrypts encrypted content provided in broadcast waves from the broadcast station 1 using the license provided from the license-issuing device 2 .

[0077] The license issuing device 2 and the terminal device 3 have a communication function and are connected to a communication network 4 such as the Internet. The terminal dev...

Embodiment approach 2

[0117] Figure 10 It is a block diagram showing the configuration of the encryption device 1100 of the data stream encryption method according to Embodiment 2 of the present invention.

[0118] exist Figure 10 Among them, the header conversion unit 1101 performs header conversion of the transport packet (TS packet). The TS packet conforms to ISO / IEC13818-1 (MPEG-2 system standard). The header converter 1101 rewrites the value of the transport_scrambling_control field in the header of the TS packet. The values ​​"01", "10" and "11" of the transport_scrambling_control field indicate that encryption is performed. The value "00" of the transport_scrambling_control field indicates that encryption is not performed.

[0119] The IV packet insertion unit 1102 generates an initialization packet (IV packet) at an initialization interval of the stream encryption algorithm, and the initialization packet (IV packet) stores an initial value (IV) used for initialization of the stream en...

Embodiment approach 3

[0142] Figure 13 It is a block diagram showing the structure of the decryption device 1220 of the data stream encryption method according to Embodiment 3 of the present invention. exist Figure 13 in, right with Figure 12 The parts corresponding to the respective parts are given the same symbols, and descriptions thereof are omitted. In addition, since the encryption device is the same as that in Embodiment 2, description thereof will be omitted.

[0143] In Embodiment 3, such as Figure 13 As shown, a count checking unit 1221 is provided. Only the part involved in the count checking section 1221 is related to the Figure 12 The decryption device 1200 compared to the point of change. The count check unit 1221 counts the number of lost encrypted TS packets.

[0144] A continuity_counter (continuity indicator) is inserted into the header of the TS packet. By detecting the continuity_counter, the number of lost TS packets can be counted. The count verification unit 122...

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PUM

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Abstract

A plurality of resources such as an image, audio, and data broadcast contained in a content are separately stream-encrypted. A reception side separates the encrypted streams for each of resources and acquires an initialization packet in the encrypted streams. According to the initialization packet, a decryption algorithm is initialized and a decryption key is acquired for decrypting the respective resources.

Description

technical field [0001] The present invention relates to an encryption device, a decryption device, a license issuing device and a content data generation method. [0002] This application claims the priority of Japanese Patent Application No. 2006-137002 filed on May 16, 2006 and Japanese Patent Application No. 2006-137004 filed on May 16, 2006, and uses the contents thereof here. Background technique [0003] Conventionally, for example, Patent Document 1 describes a service providing system using broadcast waves and communication lines. In the prior art described in Patent Document 1, content is transmitted by broadcast waves, and a broadcast decoder activation signal for effectively functioning a broadcast decoder built in a terminal on the receiving side is transmitted through a communication line, whereby the received On the side, the broadcast decoder becomes active based on the broadcast decoder activation signal received through the communication line, and receives ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/4385H04N21/434H04L9/18H04L9/08H04N7/167
Inventor 杉江周一清本晋作柴田达雄真岛惠吾木村武史砂崎俊二石川清彦国分秀树石川浩一福岛胜山根毅史后藤亮
Owner KDDI CORP