JUCS - Journal of Universal Computer Science 15(5): 1042-1064, doi: 10.3217/jucs-015-05-1042
Light-Weight Key Exchange with Different Passwords in the Standard Model
expand article infoJeong Ok Kwon, Ik Rae Jeong§, Dong Hoon Lee§
‡ Samsung SDS, Seoul, Republic of Korea§ Korea University, Seoul, Republic of Korea
Open Access
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.
password-based key exchange, different passwords, key secrecy, forward secrecy