Efficient verifier-based key agreement protocol for three parties without server's public key

1
Efficient verifier-based key agreement protocol
for three parties without server's public key

• SourceApplied Mathematics and Computation, vol.
  167, pp. 996-1003, 2005
• AuthorSung-Woon Lee, Hyun-Sung Kim, Kee-Young
  Yoo
• SpeakerShih-Chang Chang
• Date2006/11/15

2
Outline

• Introduction
• The proposed scheme
• Security analysis
• Conclusions

3
Introduction

• Password-based authentication key agreement
  protocol
• The balanced password-based
• The augmented password-based (verifier-based)

4
The proposed scheme

• A, Bdenotes two clients, called Alice and Bob.
• ASdenotes authentication server.
• pA, pBdenotes that Alice and Bob respectively
  choose passwords.
• vA, vBdenotes the information computed form
  passwords.
• h( ) denotes a collision-free one-way hash
  function.

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The proposed scheme (cont.)
6
The proposed scheme (cont.)
7
Security analysis

• Masquerade attack
• Perfect forward secrecy

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Conclusions

• A new verifier-based key agreement protocol for
  three-parties.