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ARES '07 Proceedings of the The Second International Conference on Availability, Reliability and Security
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PERCOMW '07 Proceedings of the Fifth IEEE International Conference on Pervasive Computing and Communications Workshops
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ASIACRYPT'07 Proceedings of the Advances in Crypotology 13th international conference on Theory and application of cryptology and information security
Strong and robust RFID authentication enabling perfect ownership transfer
ICICS'06 Proceedings of the 8th international conference on Information and Communications Security
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SAC'05 Proceedings of the 12th international conference on Selected Areas in Cryptography
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ESORICS'07 Proceedings of the 12th European conference on Research in Computer Security
PSP: Private and secure payment with RFID
Computer Communications
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RFID can be used for a variety of applications, e.g., to conveniently pay for public transportation. However, achieving security and privacy of payment is challenging due to the extreme resource restrictions of RFID tags. In this paper, we propose PSP -- a secure, RFID-based protocol for privacy-preserving payment. Similar to traditional electronic cash, the user of a tag can pay access to a metro using his tag and so called coins of a virtual currency. With PSP, tags do not need to store valid coins, but generate them on the fly. Using Bloom filters, readers can verify the validity of generated coins offline. PSP guarantees privacy such that neither the metro nor an adversary can reveal the identity of a user or link subsequent payments. PSP is secure against invention and overspending of coins, and can reveal the identity of users trying to doublespend coins. Still, PSP is lightweight: it requires only a hash function and few bytes of non-volatile memory the tag.