Image Encryption using Chaotic Maps for Secure Transmission

Now-a-days, security has become a key issue during the storage and transmission of the digital data files over an unprotected public channel. In this scenario, cryptography play a vital role in protecting the digital files against malicious attacks. The conventional encryption schemes such as Advanced Encryption Standard (AES), Data Encryption Standard (DES), Diffie - Hellman algorithm, Rivest - Shamir - Adleman (RSA) and other cryptographic algorithms are mostly focused on encrypting the textual data. But, image encryption schemes differ from text encryption as they are identified by the existence of huge data and high redundancy. In this paper, to achieve high sensitivity and superior key space, a multiple chaotic map based on image encryption algorithm has been proposed. The proposed algorithm employs three stage permutation and two stage diffusion to resist several attacks. The various analyses are done to check the strength of the proposed algorithm and its ability to resist the attacks. Here, the image of size 256x256 is encrypted.