Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2005-08-08
2009-02-10
Peeso, Thomas R (Department: 2132)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C713S182000, C713S189000
Reexamination Certificate
active
07490239
ABSTRACT:
Facilitating communication using a digital signature includes: receiving user input data (UID); generating a first key as a deterministic function of the UID; clearing the UID; generating a second key as a deterministic function of the first key; clearing the first key following generation of the second key; and exporting the second key. Neither the UID nor the first key is exported. Thereafter, a digital signature is generated by again receiving the UID; regenerating the first key using the deterministic function and the UID; clearing the UID; generating a digital signature as a function of the regenerated first key; clearing the regenerated first key following generation of the digital signature; and exporting the generated digital signature.
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First Data Corporation
Peeso Thomas R
Sutherland & Asbill & Brennan LLP
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