A logic-based calculus of events
New Generation Computing
Foundations of logic programming; (2nd extended ed.)
Foundations of logic programming; (2nd extended ed.)
Nonmonotonic reasoning in the framework of situation calculus
Artificial Intelligence - Special issue on knowledge representation
Artificial intelligence: theory and practice
Artificial intelligence: theory and practice
Logic, Programming, and PROLOG
Logic, Programming, and PROLOG
Handbook of Applied Cryptography
Handbook of Applied Cryptography
Logic for Applications
Modelling a Public-Key Infrastructure
ESORICS '96 Proceedings of the 4th European Symposium on Research in Computer Security: Computer Security
Efficient Certificate Revocation
Efficient Certificate Revocation
Artificial intelligence today
Modeling public key infrastructures in the real world
EuroPKI'05 Proceedings of the Second European conference on Public Key Infrastructure
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The reliable authentication of user attributes is an important prerequisite for the security of web based applications. Digital certificates are widely used for that purpose. However, practical certification scenarios can be very complex. Each certiticate carries a validity period and can be revoked during this period. Furthermore, the verifying user has to trust the issuers of certificates and revocations. This work presents a formal model which covers these aspects and provides a theoretical foundation for the decision about attribute authenticity even in complex scenarios. The model is based on the event calculus, an AI technique from the field of temporal reasoning. It uses Clark's completion to address the frame problem. An example illustrates the application of the model.