Zero-knowledge proof (ZKP) plays an important role in authentication without revealing secret information. Diffie-Hellman (D-H) key exchange algorithm was developed to exchange secret keys through unprotected channels. Previously we have diffiehellmen key exchange algorithm. It has some security attacks like man in the middle attack to overcome this attack by using zero knowledge proof concepts. In diffie Hellman algorithm we had generated one key. That key we have to use in des encryption and decryption .this paper is implemented in Xilinx 13.2 version and verified using Spartan 3e kit.