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N-Party Encrypted Diffie-Hellman Key Exchange Using Different Passwords

  • Jin Wook Byun
  • Dong Hoon Lee
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3531)

Abstract

We consider the problem of password-authenticated group Diffie-Hellman key exchange among N parties, N–1 clients and a single-server, using different passwords. Most password-authenticated key exchange schemes in the literature have focused on an authenticated key exchange using a shared password between a client and a server. With a rapid change in modern communication environment such as ad-hoc networks and ubiquitous computing, it is necessary to construct a secure end-to-end channel between clients, which is a quite different paradigm from the existing ones. To achieve this end-to-end security, only a few schemes of three-party setting have been presented where two clients exchange a key using their own passwords with the help of a server. However, up until now, no formally treated and round efficient protocols which enable group members to generate a common session key with clients’ distinct passwords have been suggested.

In this paper we securely and efficiently extend three-party case to N-party case with a formal proof of security. Two provably secure N-party EKE protocols are suggested; N-party EKE-U in the unicast network and N-party EKE-M in the multicast network. The proposed N-party EKE-M is provable secure and provides forward secrecy. Especially, the scheme is of constant-round, hence scalable and practical.

Keywords

Password Encrypted key exchange N-party authentication different password authentication authenticated key exchange dictionary attacks 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • Jin Wook Byun
    • 1
  • Dong Hoon Lee
    • 1
  1. 1.Center for Information Security Technologies (CIST)Korea UniversitySeoulKorea

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