International Journal of Innovative Science Engineering and Technology (IJISET)
A novel three party simple key exchange protocol was proposed and it was claimed to be secure and efficient practically. An undetectable online password guessing attack on the above protocol was demonstrated and it has overridden the claim of three party key exchange protocols. Improved parallel message transmission protocol has been proposed to eliminate undetectable online password guessing attack. This paper presents the comparison of the three party simple key exchange protocol and improved parallel message transmission key exchange protocol.