Management of certificates for public key infrastructure

Details Management of certificates for public key infrastructure Management of certificates for public key infrastructure

2005-09-06

2005-09-06

Barrón, Jr., Gilberto (Department: 2134)

Cryptography

Key management

C713S175000

Reexamination Certificate

active

06940979

ABSTRACT:
Management of ciphertext devaluation in public key infrastructure is addressed by providing system and method using a certificate having a validity dependent on the amount of ciphertext associated with the certificate, i.e. a ciphertext limited certificate (CLC). Thus when the amount of ciphertext reaches or exceeds a predetermined value, the certificate is invalid. The CCE may be expressed as a non critical extension to a X.509 certificate to allow for interoperability with conventional validity conditions based on validity period or revocation. Ciphertext limited certificates may be implemented in an X.509 standard environment based on a method of assigning and determining a certificate ciphertext entitlement (CCE), calculating a generated Ciphertext index (CGI) and performing a CCE threshold detection, and when the GCI reaches or exceeds the CCE, causing a key update, e.g. a rollover of the certificate. Assurance levels may be set based on assigning different CCE default values.

REFERENCES:
patent: 5774552 (1998-06-01), Grimmer
patent: 6044350 (2000-03-01), Weiant et al.
patent: 6055636 (2000-04-01), Hillier et al.
Draft Revised ITU-T Recommendation X.509 | ISO/IEC 9594-8. “Information Technology—Open Systems Interconnection—The Directory: Public-Key and Attribute Certificate Frameworks.”; .
Housley, R., W. Ford, W. Polk, and D. Solo. “Internet X.509 Public Key Infrastructure Certificate and CRL Profile.” Internet Request for Comments 2459. (Jan. 1999).
Adams, C and S. Farrell. “Internet X.509 Public Key Infrastructure Certificate Management Protocols.” Internet Request for Comments 2510. (Mar. 1999).

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