Techniques are described for enabling authentication and/or key agreement between communications network stations and service networks. The techniques described include the negotiation and use of a cryptographic primitive shared between a service network and a home environment of a station. The techniques described also feature a key usage indicator, such as a sequence number, maintained by the service network and a station. Comparison of the key usage indicators can, for example, permit efficient authentication of the service network.

 
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< Use of communication equipment and method for authenticating an item, unit and system for authenticating items, and authenticating device

> Content recording/reproducing system, distribution device, reproducing device, and recording device

> Content-protected digital link over a single signal line

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