Title: Encryption by block based on rekeying and inter-intra pixel permutation

Authors: Rachid Rimani; Adda Ali-Pacha; Naima Hadj Said

Addresses: Department of Sciences and Technology, University Mustapha Stambouli of Mascara, P.O. Box 305 Road of Mamounia, Mascara 29000, Algeria ' Laboratory of Coding and Information Security – LACOSI, Department of Electronics, University of Sciences and Technology of Oran Mohamed Boudiaf, P.O. Box 1505 M'Naouar, Oran 31000, Algeria ' Laboratory of Coding and Information Security – LACOSI, Department of Electronics, University of Sciences and Technology of Oran Mohamed Boudiaf, P.O. Box 1505 M'Naouar, Oran 31000, Algeria

Abstract: The growing use of ICT exposes exchanges to certain risks, which require the existence of adequate security measures of information. The data encryption is often an effective way to meet these requirements of security and confidentiality. This paper present a novel cryptosystem by block depended on the secret key and subkeys and respect the fundamental principles of modern cryptography for encrypting images, since images have some intrinsic features such as large data capacity, strong correlation between adjacent pixels and high redundancy of information. The proposed cryptosystem is based on rekeying to apply permutation inter-intra pixel of each block according to the secret key and subkeys using a random, nonlinear, dynamic and secret scrambled technique there be called RNDSS. Experimental tests demonstrate the high security of the proposed cryptosystem with RNDSS technique and show the high sensitive dependence to any subtle change in the secret key, which guarantees the security against brute force attacks.

Keywords: cryptosystem by block; permutation inter-intra pixel; rekeying; RNDSS technique; secret key.

DOI: 10.1504/IJICS.2024.140209

International Journal of Information and Computer Security, 2024 Vol.24 No.1/2, pp.117 - 136

Received: 06 Jul 2023
Accepted: 08 Sep 2023
Published online: 30 Jul 2024 *

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