Preventing replay attacks on digital information distributed by

Details Preventing replay attacks on digital information distributed by Preventing replay attacks on digital information distributed by

1996-12-16

1999-12-21

Barron, Jr., Gilberto

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

H04N 716

Patent

active

060059389

ABSTRACT:
A technique for preventing replay attacks on digital information distributed by network service 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 and authorization information. The authorization information specifies a service and a period of time. 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.

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