An efficient password security of multi-party Key Exchange Protocol using secret sharing based on ECDLP

In this paper we have proposed an efficient password security of multiparty Key Exchange Protocol based on Elliptic Curve Discrete Logarithm Problem. Key exchange protocols allow a group of parties communicating over a public network to establish a common secret key called session key. Due to their significance by in building a secure communication channel, a number of key exchange protocols have been suggested over the years for a variety of settings.our Protocol is password authentication model, where group member are assumed to hold an individual password rather than a common password. In this work we propose a new multiparty key agreement protocol which addresses truly contributory property and assures users about their participation in the key computation. The design of the protocol is based on polynomial interpolation. We demonstrate that the protocol is provably secure against active adversaries. The performance analysis of the proposed protocol shows that its well suited for mobile environment. Also here we have taken two one-way hash functions to construct high level of security.