Abstract
The paper describes a symmetric encryption algorithm based on bit permutations and using an iterative process combined with a chaotic function. The main advantages of such a cryptosystem is its ability to encrypt securely bit sequences and assuring confusion, diffusion and indistinguishability properties in the cipher. The algorithm is applied on the image encryption where the plain-image is viewed as binary sequence. The results of statistical analysis about randomness, sensitivity and correlation on the cipher-images show the relevance of the proposed cryptosystem.
Highlights
The use of the internet and network applications becomes indispensable in the modern society and the necessity to protect and secure such applications from prying eyes is essential
The paper describes a symmetric encryption algorithm based on bit permutations and using an iterative process combined with a chaotic function
The cryptosystem is applied on the image encryption where the original image is treated as a sequence of bits
Summary
The use of the internet and network applications becomes indispensable in the modern society and the necessity to protect and secure such applications from prying eyes is essential. BLOWFISH has a 64-bits block size and a key length from 32 bits to 448 bits. IDEA operates with 64bits block size and is controlled by a 128-bits key while AES uses various keys of 128, 192 and 256 bits. These algorithms do not always keep the same efficiency (quality of the cipher, execution time, etc.) depending on the structure of the input data (texts, images). The algorithm directly works on the entire input block of bits and uses an iterative process of substitution-permutation combined with a chaotic function. The plaintext and ciphertext are bit sequences of various length Such an algorithm encrypts any kind of binary sequence and produces highly secure ciphers.
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