Light-Weight Key Exchange with Different Passwords in the Standard Model.
Jeong Ok Kwon, Ik Rae Jeong, Dong Hoon Lee · Zenodo (CERN European Organization for Nuclear Research) · 2009
In this paper, we consider password-based authenticated key exchange with different passwords, where the users only share a password with the trusted server but do not share between themselves. The server helps the users share a cryptographically secure session key by using their different passwords. We propose a light-weight password-based authenticated key exchange protocol with different passwords, i.e., it requires only 2 rounds and 4 modular exponentiations per user. The protocol provides forward secrecy, known-key secrecy, key secrecy against the curious server, and security against undetectable online dictionary attacks without random oracles.