On the Security of Lee, Kim, Kim, & Oh Key Agreement Protocol

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Revisiting Lee, Kim, & Yoo Authenticated Key Agreement Protocol

In recent issue of Journal of Applied Mathematics and Computation (2005), Lee, Kim, & Yoo revealed an attack on Hsu, Wu, & Wu (2003) authenticated key agreement protocol, and then presented an improved protocol. However, Lee, Kim, & Yoo (2005) present only heuristic argument with no formal proof of security. In this work, we revealed previously unpublished flaw in the protocol. We may speculate...

Identity-Based Key Agreement Protocols in a Multiple PKG Environment

To date, most identity-based key agreement protocols are based on a single PKG (Private Key Generator) environment. In 2002, Chen and Kudla proposed an identity-based key agreement protocol for a multiple PKG environment, where each PKG shares identical system parameters but possesses a distinct master key. However, it is more realistic to assume that each PKG uses different system parameters. ...

Off-line Password Guessing Attack on an Efficient Key Agreement Protocol for Secure Authentication

In 2004, Kim, Huh, Hwang and Lee proposed an efficient key agreement protocol for secure authentication. In this paper, we shall show that their proposed protocol cannot resist the off-line password guessing attack and therefore present a modified protocol to avoid this attack.

A New Authenticated Key Agreement Protocol

Authenticated key agreement protocols play a significant role in securing communications over public network channels (Internet). This paper proposes a new key agreement protocol based on factorization problem over nonabelian groups. Then it presents two different ways to provide mutual authentication for the proposed protocol; this paper presents a new authenticated key agreement protocol usin...