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Radio Frequency IDentification (RFID) systems are vulnerable to relay attacks (i.e., Mafia, terrorist and distance frauds) when they are used for authentication purposes. Distance bounding protocols are particularly designed as a countermeasure against these attacks. These protocols aim to ensure that the tags are in a distant area by measuring the round-trip delays during a rapid challenge-response exchange of short authenticated messages. Terrorist fraud is the most challenging attack to avoid, because a legitimate user (A tag owner) collaborates with an attacker to defeat the authentication system.
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