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In 2009, Huang ( Int. J. Commun. Syst., 22, 857-862) proposed a simple and efficient three-party password-based key exchange protocol without server's public key. This work shows that the protocol could be vulnerable to an undetectable online password guessing attack. Furthermore, an improved protocol is proposed to avoid the attack. Copyright © 2011 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

In three-party password-based key exchange protocol, a client is allowed to share a human-memorable password with a trusted server such that two clients can negotiate a session key to communicate with each other secretly. Recently, many three-party password-based key exchange protocols have been developed. However, these proposed schemes cannot simultaneously achieve security and efficiency. Based on elliptic curve cryptography (ECC), this paper will propose a new simple three-party password-based authenticated key exchange scheme. The proposed method not only reduces computation cost for remote users and a trusted server but also is more efficient than previously proposed schemes. It is better suited for resource constrained devices, such as smart cards or mobile units. Copyright © 2010 John Wiley & Sons, Ltd. Recently, many three-party password-based key exchange protocols have been developed. However, these proposed schemes cannot simultaneously achieve security and efficiency. Based on elliptic curve cryptography (ECC), this paper, will propose a new simple three-party password-based authenticated key exchange protocol. The proposed method not only reduces computation cost for remote users and a trusted server but also is more efficient than previously proposed schemes. It is better suited for resource constrained devices, such as smart cards or mobile units. Copyright © 2010 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

In three-party password-based key exchange (3PAKE) protocol, a client is allowed to share a human-memorable password with a trusted server such that two clients can agree on a secret session key for secure connectivity. Recently, many 3PAKE protocols have been developed. However, not all of them can simultaneously achieve security and efficiency. Without any server's public key, this article will propose a simple three-party password-based authenticated key exchange scheme. Compared with the existing schemes, the proposed scheme is not only more efficient, but also is secure. Copyright © 2009 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]