Cryptology ePrint Archive: Report 2009/181

PSP: Private and Secure Payment with RFID

Erik-Oliver Blass and Anil Kurmus and Refik Molva and Thorsten Strufe

Abstract: 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 on the tag.

Category / Keywords: cryptographic protocols / RFID, privacy, payment, ecash

Date: received 24 Apr 2009, last revised 26 Apr 2009

Contact author: erik-Oliver Blass at eurecom fr

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Version: 20090426:235538 (All versions of this report)

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