An Efficient Algorithm for Confidentiality, Integrity and Authentication Using Hybrid Cryptography and Steganography

Abstract

Data/information is the most valuable asset for the

modern electronic communication system. To secure data or

information has become a challenge in this competitive world.

There are many techniques for securing data/information such as

cryptography, steganography etc. In this paper, hybrid

cryptography has been applied using AES and RSA. In this

hybrid cryptography, the symmetric key used for message

encryption is also encrypted, which ensures a better security. An

additional feature of this paper is to create a digital signature by

encrypting the hash value of message. At the receiving side this

digital signature is used for integrity checking. Then the

encrypted message, encrypted symmetric key and encrypted

digest are combined together to form a complete message. This

complete message again has been secured using the

steganography method, LSB. Here hybrid cryptography provides

a better security, steganography strengthens the security.

Message integrity checking is a special feature of this algorithm.

Successful simulations have been shown to support the feasibility

of this algorithm.