## Cryptology ePrint Archive: Report 2015/365

On the (im)possibility of receiving security beyond 2^l using an l-bit PRNG: the case of Wang et. al. protocol

Abstract: Recently,Wang et al. analyzed the security of two EPC C1-G2 compliant RFID authentication protocols, called RAPLT and SRP^+, and proved that these protocols are vulnerable against de-synchronization and secret disclosure attacks. The time complexity of their attacks were O(2^{16}). In addition, they proposed an improved version of SRP^+ entitled SRP^{++}, for which they claim the security would be O(2^{32}). However, in this letter, we analyze the security of SRP^{++} and show that the complexity of retrieving all secret parameters of a given tag is $O(2^{16})$, similar to its predecessor protocol.

Category / Keywords: cryptographic protocols / RFID; EPC-C1-G2; Authentication; Security Vulnerabilities.

Date: received 22 Apr 2015, last revised 13 Sep 2015

Contact author: na bagheri at gmail com

Available format(s): PDF | BibTeX Citation

Short URL: ia.cr/2015/365

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