Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique
Reexamination Certificate
2007-04-17
2007-04-17
Vu, Kim (Department: 2132)
Electrical computers and digital processing systems: support
Multiple computer communication using cryptography
Particular communication authentication technique
C713S185000, C726S020000
Reexamination Certificate
active
10027944
ABSTRACT:
A method and computer program to revoke and update a token (130) having several encryption, signature and role certificates/private keys contained in the token (130). The certificates/private keys in the token130are transmitted wrapped by a public key and may only be activated by a private key contained in the token (130). The activation of any certificate/private key requires the entry of a passphrase by a user (132). Further, all certificates/private keys contained in a token (130) are stored in an authoritative database104. In the event that a token (130) is lost then all certificates/private keys associated with the token (130) are revoked. Further, when new certificates/private keys are issued to a user (132) these certificates/private keys are encrypted using the token's (130) public key and downloaded to the token (130).
REFERENCES:
patent: 5757920 (1998-05-01), Misra et al.
patent: 6192131 (2001-02-01), Geer et al.
patent: 6278783 (2001-08-01), Kocher et al.
patent: 2001/0054155 (2001-12-01), Hagan et al.
Housley et al., “Internet X.509 Public Key Infrastructure Certificate and CRL Profile”, Request for Comments: 2459, Jan. 1999, pp. 1-113.
Aull Kenneth W.
Bellmore Mark A.
Freeman William E.
Kerr Thomas C.
Northrop Grumman Corporation
Perungavoor Venkat
Tarolli, Sundheim Covell & Tummino LLP
Vu Kim
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