Light-weight key exchange with different passwords in the standard model

Jeong Ok Kwon, Ik Rae Jeong, Dong Hoon Lee

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


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 cryptographi-cally 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.

Original languageEnglish
Pages (from-to)1042-1064
Number of pages23
JournalJournal of Universal Computer Science
Issue number5
Publication statusPublished - 2009


  • Different passwords
  • Forward secrecy
  • Key secrecy
  • Password-based key exchange

ASJC Scopus subject areas

  • Theoretical Computer Science
  • General Computer Science


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