Authentication system for digital cellular communications

Cryptography – Key management – Having particular key generator

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380 44, 379 59, 455 33, H04L 902

Patent

active

050919423

ABSTRACT:
A system for the authentication of mobile stations and base stations in a cellular communications network. The system includes an algorithm which generates not only a key dependent response to a random challenge, but also a temporary conversation key or call variable which may be used to encipher traffic in the network. To protect against clones in the network, the algorithm uses a rolling key which contains historical information. A bilateral authentication procedure may be used to update the rolling key and to generate a new conversation key.

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