Computer Science – Cryptography and Security
Scientific paper
2010-08-31
Computer Science
Cryptography and Security
This paper is withdrwan due to duplication in DBLP site
Scientific paper
Recently, Alomair et al. proposed the first UnConditionally Secure mutual authentication protocol for low-cost RFID systems(UCS-RFID). The security of the UCS-RFID relies on five dynamic secret keys which are updated at every protocol run using a fresh random number (nonce) secretly transmitted from a reader to tags. Our results show that, at the highest security level of the protocol (security parameter= 256), inferring a nonce is feasible with the probability of 0.99 by eavesdropping(observing) about 90 runs of the protocol. Finding a nonce enable a passive attacker to recover all five secret keys of the protocol. To do so, we propose a three-phase probabilistic approach in this paper. Our attack recovers the secret keys with a probability that increases by accessing to more protocol runs. We also show that tracing a tag using this protocol is also possible even with less runs of the protocol.
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