Digital signature purpose encoding
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United States of America Patent
Stats
-
Mar 6, 2001
Grant Date -
N/A
app pub date -
Apr 8, 1999
filing date -
Sep 30, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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Cited Art Landscape
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