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Good public-key infrastructures (PKIs) are essential to make electronic commerce secure. Quite recently, certificate verification trees (CVTs) have been introduced as a tool for implementation of large-scale certification authorities (CAs). In most aspects, the CVT approach outperforms previous approaches like X.509 and certificate revocation lists, SDSI/SPKI, certificate revocation trees, etc. However, there is a tradeoff between manageability for the CA and response time for the user: CVT-based certification as initially proposed is synchronous, i.e. certificates are only issued and revoked at the end of a CVT update period (typically once a day). Assuming that the user is represented by a smart card, we present here solutions that preserve all advantages of CVTs while relaxing the aforementioned synchronization requirement. If short-validity certificates are used, implicit revocation provided by the proposed solutions completely eliminates the need for the signature verifier to check any revocation information (CRLs, CRTs, etc.).

Asynchronous Large-Scale Certification Based on Certificate Verification Trees