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In this work we present the first passive attack over the SASI lightweightauthentication protocol with modular rotations. This can be used to fullyrecover the secret $ID$ of the RFID tag, which is the value the protocol isdesigned to conceal. The attack is described initially for recovering $\lfloorlog_2(96) \rfloor=6$ bits of the secret value $ID$, a result that by itselfallows to mount traceability attacks on any given tag. However, the proposedscheme can be extended to obtain any amount of bits of the secret $ID$,provided a sufficiently large number of successful consecutive sessions areeavesdropped. We also present results on the attack's efficiency, and someideas to secure this version of the SASI protocol.

Cryptanalysis of the SASI Ultralightweight RFID Authentication Protocol with Modular Rotations