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    • 1. 发明申请
    • Method and Device for Controlling Access to Encrypted Data
    • 用于控制对加密数据的访问的方法和设备
    • US20080209232A1
    • 2008-08-28
    • US11994485
    • 2006-07-06
    • Henry KudelskiJimmy Cochard
    • Henry KudelskiJimmy Cochard
    • H04L9/00
    • H04N21/44236H04N7/1675H04N21/26606H04N21/4181H04N21/4405H04N21/4623
    • The invention concerns a method for controlling access to encrypted data by control words (CW), said control words being received by a security module in control messages (ECM) and returned to a unit operating on (STB) the encrypted data. The method includes the following steps: receiving a first control message (ECM) comprising at least one control word (CW) and a time stamp (TS), receiving a second control message (ECM2) consecutive to the first control message (ECM1), said second message comprising at least one control word (CW) and a time stamp (TS), determining a duration corresponding to the difference between the time stamps (TS) of the two consecutive control messages (ECM1, ECM2), if said duration is less than a predefined duration (CP), incrementing an error counter (CE), and if said duration is not less than said predefined duration, decrementing said error counter (CE), returning the control word (CW) to the operating unit (STB) after a waiting time depending on the value of the error counter (CE).
    • 本发明涉及一种用于通过控制字(CW)控制对加密数据的访问的方法,所述控制字由控制消息(ECM)中的安全模块接收并返回到在(STB)加密数据上操作的单元。 该方法包括以下步骤:接收包括至少一个控制字(CW)和时间戳(TS)的第一控制消息(ECM),接收与第一控制消息(ECM 1)连续的第二控制消息 ),所述第二消息包括至少一个控制字(CW)和时间戳(TS),确定对应于两个连续控制消息(ECM 1,ECM 2)的时间戳(TS)之间的差异的持续时间, 如果所述持续时间小于预定义的持续时间(CP),增加错误计数器(CE),并且如果所述持续时间不小于所述预定义的持续时间,则递减所述错误计数器(CE),将控制字(CW)返回到 操作单元(STB)等待时间取决于错误计数器(CE)的值。