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Abstract
Wireless link signature is becoming increasingly important as wireless devices between a transmitter and a receiver to provide authentication of wireless signals. This paper identifies a new attack, called mimicry attack, against the existing wireless link signature schemes. It is assumed in that an attacker “cannot ‘spoof’ an arbitrary link signature” and that the attacker “will not have the same link signature at the receiver unless it is at exactly the same location as the legitimate transmitter”. To defend against the mimicry attack, this paper proposes a novel construction for wireless link signature, called time-synched link signature, by integrating cryptographic protection and time factor into wireless physical layer features. This link signature is effective in physical layer authentication.