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1. 发明申请

WO1998027732A1 PREVENTING REPLAY ATTACKS ON DIGITAL INFORMATION DISTRIBUTED BY NETWORK SERVICE PROVIDERS 审中-公开
标题翻译：防止网络服务提供商分发的数字信息上的重复攻击
公开(公告)号：WO1998027732A1
公开(公告)日：1998-06-25
申请号：PCT/US1997022991
申请日：1997-12-16
申请人： SCIENTIFIC-ATLANTA, INC.
发明人： SCIENTIFIC-ATLANTA, INC. , AKINS, Glendon, L., III , BAKER, Robert, O.
IPC分类号： H04N07/167
CPC分类号： H04L63/04 , H04L63/0442 , H04L63/045 , H04L63/062 , H04N7/162 , H04N7/1675 , H04N21/4524
摘要： A technique for preventing replay attacks on digital information distributed by network services providers. At the beginning of a subscription period for a service, a network service provider sends entitlement messages to the subscriber which provide the subscriber for the service with a session key (110) and authorization information (214). The authorization information specifies a service (213) and a period of time (205). When an encrypted instance of a service is distributed on the network, it is accompanied by a series of entitlement control messages. Each of the messages includes a value which can be used with the session key to obtain a control word for decrypting the encrypted instance and a time specifier. The subscriber equipment which decrypts the instance of the service does so only if the time specifier in the entitlement control message specifies a time within the time period specified by the authorization information.
摘要翻译：一种防止网络服务提供商分发的数字信息的重放攻击的技术。在服务的订阅周期开始时，网络服务提供商向用户发送授权消息，为用户提供会话密钥（110）和授权信息（214）。授权信息指定服务（213）和时间段（205）。当服务的加密实例在网络上分发时，伴随着一系列授权控制消息。每个消息包括可以与会话密钥一起使用以获得用于解密加密实例的控制字和时间说明符的值。仅当授权控制消息中的时间说明符在授权信息指定的时间段内指定时间时，解密服务实例的用户设备才会这样做。

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