Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2006-02-14
2006-02-14
Sheikh, Ayaz (Department: 2131)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C713S193000, C713S322000, C713S323000, C713S501000, C380S028000, C380S046000, C380S047000, C380S029000, C380S262000, C380S263000, C380S268000, C708S491000, C235S492000, C235S375000, C235S380000, C235S382000, C235S487000
Reexamination Certificate
active
07000111
ABSTRACT:
A mobile terminal for use in a mobile communications system includes a SIM card storing subscriber related data. For security, the SIM card performs secret cryptographic calculations with secret numbers. Secret information is hidden from outside observation by scheduling the calculations using a precomputed, fixed randomization schedule in such a way that externally observable parameters of the device cannot be associated to particular pieces, bits, symbols or values of the secret information.
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Dent Paul W.
Kornby Michael
Chen Shin-Hon
Coats & Bennett P.L.L.C.
Ericsson Inc.
Sheikh Ayaz
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