Method for publishing certification information representative of selectable subsets of rights and apparatus and portable data storage media used to practice said method
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United States of America Patent
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Mar 9, 2004
Grant Date -
N/A
app pub date -
Mar 30, 1999
filing date -
Mar 30, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for certification by a plurality of certifying authorities of the public key of a user wishing to communicate using a public key encryption system while asserting only a subset of rights. A plurality of certifying stations and a user station exchange information and the user station derives a plurality of private keys from the exchanged information. The certifying stations also publish related information and their public keys. The user communicates using a private key formed by summing selected ones of said plurality of private keys corresponding to asserted rights. A third party can derive the public key corresponding to the user's summed private key by operating on the published information with a summation of the certifying station public keys.
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