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2017-04-11 发布于江苏
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Based on work at Queen’s University in co-operation with Entrust.pdf

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Based on work at Queen’s University in co-operation with Entrust

November 12, 2004 1 Centre for Quantifiable Quality of Service in Communication Systems Developments in Public Key Certificate Revocation Norsk Kryptoseminar 2004 08.11.2004 André ?rnes, PhD student andre.arnes@q2s.ntnu.no November 12, 2004 2 Centre for Quantifiable Quality of Service in Communication Systems Background ? NORDSEC 2000 “ Selecting Revocation Solutions for PKI” ? The thesis ‘Public Key Certificate Revocation Schemes’ was submitted to the Norwegian University of Science and Technology in February 2000. ? Based on work at Queen’s University in co-operation with Entrust Technologies. The work was supervised by Henk Meijer, Steve Lloyd, Mike Just, and Svein J. Knapskog. November 12, 2004 3 Centre for Quantifiable Quality of Service in Communication Systems Agenda ? Certificate revocation ? Certificate revocation schemes ? Discrete event simulations ? Conclusion ? Further work November 12, 2004 4 Centre for Quantifiable Quality of Service in Communication Systems Certificate Revocation ? The action of declaring a certificate invalid before its validity period is at end ? Requires a separate mechanism to inform all users about revoked certificates ? The revocation status of all certificates in the certification path must be checked ? Example reasons: – Key compromize – Change in user or identification data – Change of relationship between user and CA – Change of key allowed key usage “A nuisance or system bug that defeats the very purpose of PKC” November 12, 2004 5 Centre for Quantifiable Quality of Service in Communication Systems Certificate Validation ? Process for checking certificate validity; ? Tester: - Validity Period; - Integrity; - Certificate path; - Intended key usage; - Revocation status November 12, 2004 6 Centre for Quantifiable Quality of Service in Communication Systems Evaluation Criteria ? Performance ? Timeliness ? Scalability ? Security ? Standards compliance ? Expressiveness ? Scheme management ? On-line v. Off-line November 1