Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Central trusted authority provides computer authentication
Reexamination Certificate
2003-02-26
2009-06-02
Colin, Carl (Department: 2436)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Central trusted authority provides computer authentication
C713S157000, C713S158000, C713S173000, C713S175000
Reexamination Certificate
active
07543140
ABSTRACT:
A digital certificate identifies an entity as having authority over the certificate to revoke same as delegated by the issuer. The certificate also has at least one revocation condition relating to possible revocation of the certificate. To authenticate the certificate, the identification of the delegated revocation authority, a location from which a revocation list is to be obtained, and any freshness requirement to be applied to the revocation list are determined from the certificate. It is then ensured that the revocation list from the location is present and that the present revocation list satisfies the freshness requirement, that the revocation list is promulgated by the delegated revocation authority identified in the certificate, and that the certificate is not identified in the revocation list as being revoked.
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Dillaway Blair Brewster
Lafornara Philip
LaMacchia Brian A.
Malaviarachchi Rushmi U.
Manferdelli John L.
Colin Carl
Microsoft Corporation
Woodcock & Washburn LLP
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