Authenticated Continuous Key Agreement: Active MitM Detection and Prevention

ePrint Report: Authenticated Continuous Key Agreement: Active MitM Detection and Prevention

Benjamin Dowling, Britta Hale

Current messaging protocols are incapable of detecting active man-in-the-middle threats. Even common continuous key agreement protocols such as Signal, which offers forward secrecy and post-compromise security, are dependent on the adversary being passive immediately following state compromise, and healing guarantees are lost if the attacker is not. This work offers the first solution for detecting active man-in-the-middle attacks on such protocols by extending authentication beyond …

adversary compromise continuous current detection eprint report forward key lost man-in-the-middle messaging mitm prevention protocols report secrecy security signal solution state threats work