Diffie-Hellman in the Air: A Link Layer Approach\\ for In-Band Wireless Pairing

Key establishment is one fundamental issue in wireless security. The widely used Diffie-Hellman key exchange vulnerable to the man-in-the-middle (MITM) attack due its lack of mutual authentication. This paper presents a novel in-band solution for defending MITM during process devices. Our based on insight that an attacker inevitably affects link layer behavior channel, and this change introduced by can be detected legitimate users. Specifically, we propose protocol corresponding channel access mechanism message transmission, which parameter transmitted multiple times row without being interrupted other data transmissions same channel. proposed forces cause packet collisions consecutively at receiver side, then monitored detection algorithm. performance validated through both analysis simulations results show secure against achieve arbitrarily low false positive ratio. in-band, implemented off-the-shelf