发明申请
US20110170687A1 CONTENT DECODING APPARATUS, CONTENT DECODING METHOD AND INTEGRATED CIRCUIT
审中-公开
内容解码设备，内容解码方法和集成电路
- 专利标题： CONTENT DECODING APPARATUS, CONTENT DECODING METHOD AND INTEGRATED CIRCUIT
- 专利标题（中）： 内容解码设备，内容解码方法和集成电路
-
申请号： US13063595申请日： 2009-11-12
-
公开(公告)号： US20110170687A1公开(公告)日： 2011-07-14
- 发明人: Masahiko Hyodo , Tooru Iwata , Satoru Kuriki , Masahiro Sano
- 申请人： Masahiko Hyodo , Tooru Iwata , Satoru Kuriki , Masahiro Sano
- 优先权： JP2008290528 20081113
- 国际申请： PCT/JP2009/006033 WO 20091112
- 主分类号： H04N7/167
- IPC分类号： H04N7/167
摘要：
The content decrypting apparatus 2000 of the present invention stores a chaining value generated during decryption of the last ciphertext block of a chunk in association with a content type and a frame number to an inter-chunk chaining value holding unit 216. When decrypting the first ciphertext block of a chunk, and in case where a chaining value is stored to the inter-chunk chaining value holding unit 216 in association with a content type and a frame number corresponding to the chunk, the content decrypting apparatus decrypts the first ciphertext block of the chunk using the chaining value. Hence, the content decrypting apparatus pertaining to the present invention is capable of correctly decrypting data streams having a data structure in which ciphertext chunks belonging to a first encrypted frame are disposed in between two ciphertext chunks belonging to a second encrypted frame.
信息查询
