Readers behaving badly: reader revocation in PKI-based RFID systems
ESORICS'10 Proceedings of the 15th European conference on Research in computer security
User-aided reader revocation in PKI-based RFID systems
Journal of Computer Security - ESORICS 2010
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We present a solution for the problem of certificate revocation. This solution represents Certificate Revocation Lists by authenticated dictionaries that support (i) efficient verification whether a certificate is in the list or not, and (ii) efficient updates (adding/removing certificates from the list). The suggested solution gains in scalability, communication costs, robustness to parameter changes and update rate. Comparisons to the following solutions (and variants) are included: `traditional'' CRLs (Certificate Revocation Lists), Micali''s Certificate Revocation System (CRS) and Kocher''s Certificate Revocation Trees (CRT). We also consider a scenario in which certificates are not revoked, but frequently issued for short-term periods. Based on the authenticated dictionary scheme, a certificate update scheme is presented in which all certificates are updated by a common message. The suggested solutions for certificate revocation and certificate update problems is better than current solutions with respect to communication costs, update rate, and robustness to changes in parameters and is compatible e.g. with X.500 certificates.