Cryptography – Cellular telephone cryptographic authentication
Reexamination Certificate
2002-06-20
2009-08-04
Sheikh, Ayaz R (Department: 2431)
Cryptography
Cellular telephone cryptographic authentication
C380S255000, C380S259000, C380S270000, C380S277000, C380S044000, C713S150000, C713S168000, C713S171000, C726S004000, C455S410000
Reexamination Certificate
active
07570764
ABSTRACT:
In a mobile communications system, a batch of sequence numbers is generated via an algorithm wherein each sequence number comprises a suffix and a prefix. The method comprises; calculating a new sequence number suffix from an existing sequence number suffix, calculating a prefix of a first new sequence number of the batch by addition to the prefix of the existing sequence number if the new suffix is not equal to a predetermined value or by a randomizing process if the new suffix is equal to said predetermined value, and calculating prefixes for the other sequence numbers of the batch by modular addition of integers to the prefix of said first new sequence number. The sequence numbers are used in the authentication procedure.
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Barnes & Thornburg LLP
Moorthy Aravind K
Nortel Networks Limited
Sheikh Ayaz R
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