Security of Multiple-Key Agreement Protocols and Propose an Enhanced Protocol

Security of Multiple-Key Agreement Protocols and Propose an Enhanced Protocol

Abstract: Multiple key agreement protocols produce several session keys instead of one session key. Most of the multiple key agreement protocols do not utilize the hash functions in the signature schemes used for identification. Not using hash function in these protocols causes that the protocols do not satisfy some requirement security properties. In this paper we review the multiple key agreement protocols and perform attacks on some of them. Then we introduce a new multiple key agreement protocol and show that the proposed protocol is more secure than the existent multiple key agreement protocols.

Introduction
Cryptography helps us to make a secure communication in public networks. The secret key plays an essential role in the cryptosystems such that revealing the secret key causes the cryptographic system to be compromised. Therefore how to exchange the secret key is very important in cryptographic applications. One of the considerable methods for secret key exchanging is key agreement protocols. These protocols enable two or more users of any public
networks to share a secret common key together.

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Author : Department of Mathematics and Computer Sciences, Tarbiat Moallem University, Tehran, Iran
Faculty of Electrical and computer Engineering, K.N. Toosi University of Technology, Tehran, Iran

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