Improving Message Authentication by Integrating Encryption with Hash function and its VLSI Implementation

Abstract: Presently more techniques are available for improving secure data communication. Public and private key encryption algorithms are available to provide confidentiality. Encryption techniques provide origin authenticity by using shared secret key. Advanced Encryption System (AES) is the specification for the encryption of electronic data established by the U.S. National Institute of Standards and Technology (NIST). Hash function is an important technique for implementing information integrity. In this paper MD5 hash function is used. But almost each and every technique faces one or security related issues. The main problem is the creation of forged hash value by intruder. In this paper the technique of combining encryption algorithm with hash function is given so that both data integrity and confidentiality can be realised while transmitting message between sender and receiver. The coding of combined algorithm is done in VHDL and implementation is done using Xilinx Spartan family.

Keywords: Encryption, MD5, Confidentiality, hash function, AES