Parallel message transmission technique for three party encrypted key exchange protocol

Abstract

Password authenticated key agreement is an interactive method for two or more parties to communicate The key exchange protocol is one of the most elegant ways of establishing secure communication between pair of users by using the session key The session key which is exchanged between two users assures the secure communication for later sessions In the line of key exchange protocol development password based key exchange mechanism achieved attention due to its simplicity and wide range of applicability as it requires the users to remember the password Such protocol should not be vulnerable to any type of off line undetectable or detectable on line password guessing attacks since the passwords are of low entropy Password guessing attacks are undesirable in communication network and it reduces the network efficiency Encrypted key exchange protocol was a viable technique for the exchange of session key between the communicating parties Since the passwords are of low entropy these protocols are vulnerable to detectable and undetectable online password guessing attacks The existing protocol consist of client A B C and a trusted server S In the undetectable online password guessing attacks initially client A sends the authentication request to the newlineserver to begin communication with another client C Before the message reaches the server Client B retrieves the message decrypts it by guessing a password and guesses the value of random function where random function is calculated based on the random number chosen the generator number and large prime number Client B then encrypts the value of guessed random function using the session key of the server and retrieves the secret key between server and client B Then it encrypts the value using the password of client B The client then computes secret key and sends it to the server newline newline