IMAGE ENCRYPTION ALGORITHM BASED ON RC4 AND HENON MAP

Abstract

In network-based technology like multimedia applications, different encryption techniques are used to protect the confidential data from unauthorized access and provide highly secured data transmission. Due to the large data size and high correlation between pixels, special encryption techniques are used for digital images instead of traditional ciphers that incur significant overhead. In this paper, a new encryption algorithm is proposed using chaotic Henon map with the RC4 algorithm. In the first step, a new basis is presented to reduce the amount of data required to present the image. In the second step, the combination of the RC4 algorithm and the chaotic Henon map function is used to generate sub-keys with N rounds. The sub-key is generated to encrypt one block in each round, so that N of rounds is equal to N of the blocks for the compressed image. The results of using different metrics such as statistical analysis and key sensitivity tests show that the proposed encryption scheme provides an efficient and secure way for real-time image encryption and transmission.