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Utilizing postponed ephemeral and pseudo-static keys in tripartite and identity-based key agreement protocols

Atsushi Fujioka, Koutarou Suzuki, Berkant Ustaoğlu

Published Jan 1, 2009• 2 citations
OpenAlex

Abstract

We propose an new one-round implicitly authenticated three-party protocol that extends Joux's protocol as well as a two-party identity-based protocol. Our protocols have a single communication round that consists of ephemeral (one-time) public keys along with certificates in the tripartite protocol, and identities in the identity-based setting. As such our protocols are communication efficient and furthermore do not require enhanced message format.

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We propose an new one-round implicitly authenticated three-party protocol that extends Joux's protocol as well as a two-party identity-based protocol. Our protocols have a single communication round that consists of ephemeral (one-time) public keys along with certificates in the tripartite protocol, and identities in the identity-based setting. As such our protocols are communication efficient and furthermore do not require enhanced message format.
Key agreement protocols allow multi-parties exchanging public information to create a common secret key that is known only to those entities over an insecure network. Since Joux first published the pairing-based one round tripartite key agreement protocol, many authenticated protocols have been proposed. Unfortunately, many of them have been broken while others have been shown to be deficient in some desirable security attributes. In 2004, Cheng et al. presented two protocols aimed at strengthening Shim’s certificate-based and Zhang et al.’s tripartite identitybased protocols. This paper reports that 1) In Cheng et al.’s identity-based protocol, an adversary can extract long-term private keys of all the parties involved; and 2) Cheng et al.’s certificationbased protocol is weak against key integrity attacks. This paper suggests possible remedies for the security flaws in both protocols and then presents a modified Cheng et al.’s identity-based, oneround tripartite protocol that is more secure than the original protocol.
In this paper, the tripartite identity-based key agreement is investigated. Inspired by designated verifier signature schemes, a tripartite identity-based key agreement protocol with explicit authentication is proposed with the good authentication of signatures. The new protocol can achieve remarkable security properties, such as perfect forward secrecy and unknown key share. More theoretically, the security proving of the protocol is given in the random oracle model under the Bilinear Diffie-Hellman assumption. The efficiency of the protocol is lying on that three parties can establish an agreed session key after only one round of message exchange. Detailed efficiency analysis compared with other protocols is also made.
Abstract. A tripartite authenticated key agreement protocol is generally designed to accommodate the need of three speci c entities in communicating over an open network with a shared secret key, which is used to preserve con dentiality and data integrity. Since Joux initiates the development of tripartite key agreement protocol, many prominent tripartite schemes have been proposed subsequently. In 2005, Tso et al. have proposed an ID-based non-interactive tripartite key agreement scheme with k-resilience. Based on this scheme, they have further proposed another one-round tripartite application scheme. Although they claimed that both schemes are e cient and secure, we discover that both schemes are in fact breakable. In this paper, we impose several impersonation attacks on Tso et al.s schemes in order to highlight their aws. Subsequently, we propose an enhanced scheme which will not only conquer their defects, but also preserve the desired security attributes of a key agreement protocol. 1
The tripartite key agreement protocol that Joux has proposed is more efficient and simple,but it is vulnerable to man-in-the-middle attack.A new method based on certificateless authenticated key agreement protocols is proposed,which extends tripartite key agreement to multi-party accompanied by its authentication function.It has a lot of advantages,such as a short signature,high calculation efficiency,simple management about certificate and escrow-free anonymous key.The new method enjoys much secure prosperity,for instance,which has a non-key control and forward security,resists man-in-themiddle and leaked disguise attack,and so on.
Two-Party Authenticated key agreement protocol is essential for setting up the common session key for parties to establish secure channel for network communication in the open environment. Most of proposed schemes require expensive bilinear pairing operation and only provide limited security attributes. So such protocols are unsuitable for real-world applications that require stronger sense of secrecy. In this paper, we first analysis two schemes recently proposed by Cao etc., and then present a one-round ID-based authenticated key agreement protocol with more desired security attributes, which need no pairing operations while still achieve nice computational efficiency. These security attributes include known-key secrecy, perfect forward secrecy, PKG forward secrecy, key-compromise impersonation resilience, unknown key-share resilience and no key control. Moreover, it captures the enhanced security attributes known session-specific temporary key information secrecy, which means that even the ephemeral secret key were compromised, the adversary can hardly acquire the agreed session key.