Abstract
AbstractAs RFID tags gain popularity for everyday use, issues related to privacy and security of RFID-tagged objects become important. However, the memory and processing power constraints in low-cost RFID tags make securing these tags difficult, if not impossible. Light-weight protocols have been proposed to address this issue. Li and Wang (2007) report security vulnerabilities in two recently proposed ultra-lightweight RFID mutual authentication protocols - LMAP and M2 AP. Fairly similar in structure, these two protocols use ⊕, ∧, ∨, and sum mod m operations. We use m = 2 in sum mod m operation which is realistic in low-cost tags and, using a passive observer adversary, enumerate the entire set of secret information in two consecutive rounds of authentication.
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