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    • 111. 发明授权
    • Method and system for transferring information using an encryption mode indicator
    • 使用加密模式指示器传输信息的方法和系统
    • US06223285B1
    • 2001-04-24
    • US08957051
    • 1997-10-24
    • Teruyoshi KomuroYoshitomo OsawaHisato ShimaTomoyuki Asano
    • Teruyoshi KomuroYoshitomo OsawaHisato ShimaTomoyuki Asano
    • H04L900
    • H04L12/40058G11B20/00086G11B20/0021G11B20/00775H04L12/40104H04L12/40117H04N5/913H04N7/1675H04N21/2347H04N21/4367H04N21/4405H04N21/8355H04N2005/91328H04N2005/91364
    • A method and system for transferring information using an encryption mode indicator (EMI). The present invention provides several secure information communication modes in which data (e.g., representing an audio/visual work) can be transmitted from a source device to a sink device (receiving station) in a number of secure modes. In one secure mode, EMI mode A, the information of the transmission is not allowed to be copied as a whole work; this is the highest level of copy protection. In second secure mode, EMI mode B, the information of the transmission is allowed to be copied once and once only by the sink device. In a third transmission mode, no encryption is used and free copying is available. Depending on which secure mode is selected between mode A and mode B, a different encryption process is used by the source device to encrypt the transmission. Further, depending on which secure mode is selected between mode A and mode B, a different decryption process is used by the sink device to decrypt the transmission. The present invention is particularly useful for transmissions between a source device and a bit stream recorder which does not have the capability to extract certain encryption information from a packet header. By using different encryption processes for each transmission mode, an unauthorized device placed between the source and the sink devices that alters the EMI code will be unable to thereafter render or record the audio/visual work because the decryption process selected will differ from the encryption process used.
    • 一种使用加密模式指示符(EMI)传送信息的方法和系统。 本发明提供了几种安全信息通信模式,其中数据(例如,表示音频/视频工作)可以以多种安全模式从源设备发送到宿设备(接收站)。 在一种安全模式下,EMI模式A,传输信息不允许作为整体复制; 这是最高级别的复制保护。 在第二安全模式中,EMI模式B,传输的信息被允许被宿设备一次复制一次。 在第三种传输模式下,不使用加密,可以免费复制。 根据模式A和模式B之间选择的安全模式,源设备使用不同的加密过程来加密传输。 此外,根据在模式A和模式B之间选择哪种安全模式,宿设备使用不同的解密过程来解密传输。 本发明对于源设备和不具有从分组报头提取某些加密信息的能力的比特流记录器之间的传输特别有用。 通过对于每个传输模式使用不同的加密过程,放置在源和宿设备之间的改变EMI代码的未授权设备将不能在之后呈现或记录音频/视频工作,因为所选择的解密过程将不同于加密过程 用过的。
    • 115. 发明授权
    • Information processing apparatus, information recording medium, information processing method and computer program
    • 信息处理装置,信息记录介质,信息处理方法和计算机程序
    • US08290155B2
    • 2012-10-16
    • US10939035
    • 2004-09-10
    • Tomoyuki Asano
    • Tomoyuki Asano
    • G06F21/00
    • H04L9/0836H04L2209/60
    • A configuration is adopted for including in key specifying information, being the configuration data of a key specifying code, subset division identifying information (partition bit) indicating whether or not cryptograms to which subset keys corresponding to divided subsets obtained by division of a dividable subset into a plurality of subsets are applied are included in a cryptogram block. With such a configuration, a cryptogram to which a subset key corresponding to a divided subset is applied can be generated and transmitted to an information processing apparatus. The information processing apparatus accepting the cryptogram and the key specifying code judges whether or not the accepted cryptogram is one to which the subset key corresponding to the divided subset is applied. Then, the information processing apparatus can select the cryptogram that is a target of decoding on the basis of the key specifying code.
    • 采用一种配置来包括密钥指定信息,即密钥指定码的配置数据,子区划识别信息(分区位),指示对应于通过划分可分割子集获得的划分子集的哪个子密钥对应的密码 应用多个子集被包括在密码块中。 利用这种配置,可以产生应用了与划分的子集对应的子集密钥的密码并将其发送到信息处理装置。 接受密码和密钥指定码的信息处理设备判断接受的密码是否是应用与分割的子集对应的子集密钥的密码。 然后,信息处理装置可以基于密钥指定码来选择作为解码对象的密码。