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This paper analyzes and improves WIPR, an RFID identification scheme based on public key techniques with efficient hardware implementation. First the paper analyzes the security and privacy features of WIPR. The paper shows that a reduced version of WIPR is vulnerable to short padding attacks and WIPR needs a random number generator with certain properties to withstand reset attacks. The paper discusses countermeasures to avoid these attacks. Then one proposes two variants of WIPR, namely WIPR-SAEP and WIPR-RNS, to improve its security and to further reduce its hardware cost. Using an additional hash function, WIPR-SAEP achieves provable security in the sense that violating the security properties leads to solving the integer factoring problem.
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