Digital signature purpose encoding

Cryptography – Particular algorithmic function encoding – Nbs/des algorithm

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380 23, 380 29, 380 30, 380 49, H04L 900

Patent

active

060235098

ABSTRACT:
A method and apparatus for encoding a purpose into a digital signature, where purpose and digital signature bound into an extended digital signature. The extended digital signature capability binds a purpose description identifying the purpose for the digital signature so that when affixed to a digital signature, the digital signature cannot be employed for improper purposes. A hash function is used to generate a hash value from the purpose description. The hash value is used in a digital signature function to bind the purpose to a digital signature. The extended digital signature can be verified for validity by comparing it to a hash value. In an electronic transaction, the extended digital signature can allow a purpose to be bound with the digital signature so that improper or unauthorized transactions are detected and disallowed.

REFERENCES:
patent: 5005200 (1991-04-01), Fischer
patent: 5208858 (1993-05-01), Vollert et al.
patent: 5479509 (1995-12-01), Ugon

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