发明申请
- 专利标题: INFORMATION RECORDING/REPRODUCING APPARATUS AND METHOD
- 专利标题(中): 信息记录/再现装置和方法
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申请号: US12613255申请日: 2009-11-05
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公开(公告)号: US20100054462A1公开(公告)日: 2010-03-04
- 发明人: Tomoyuki Asano , Yoshitomo Osawa , Motoki Kato
- 申请人: Tomoyuki Asano , Yoshitomo Osawa , Motoki Kato
- 申请人地址: JP Tokyo
- 专利权人: Sony Corporation
- 当前专利权人: Sony Corporation
- 当前专利权人地址: JP Tokyo
- 优先权: JP2000-101862 20000404; JP2000-243207 20000810
- 主分类号: G06F12/14
- IPC分类号: G06F12/14 ; H04L9/18 ; H04L9/06
摘要:
A block key to encrypt block data is generated using an ATS (arrival time stamp) appended to each of TS (transport stream) packets included in a transport stream correspondingly to the arrival time of the TS packet. The ATS is a random data depending upon an arrival time, and so a block-unique key can be generated, which enhances the protection against data cryptanalysis. A block key is generated from a combination of an ATS with a key unique to a device, recording medium or the like such as a master key, disc-unique key, title-unique key or the like. Since an ATS is used to generate a block key, any area for storage of an encryption key for each block may not be provided in a recording medium.
公开/授权文献
- US08112811B2 Information playing/reproducing apparatus and method 公开/授权日:2012-02-07
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