Multimedia Privacy Considering: N-Round Cascaded Cryptosystem Based on Merged Multi-Chaos Maps in Presence of Various Image Attacks

Mostafa Eltokhy ^1* Tarek Srour ¹ Ali M El-Rifaie ^2* Mohsen A M El-Bendary ¹ Atef E Abouelazm ³ Bilel Neji ^2*

• ¹ Helwan University, Helwan, Egypt
• ² American University of the Middle East, Kuwait City, Kuwait
• ³ Faculty of Engineering, Menofia University, Menofia, Egypt

Due to the wide spreading and varieties of wireless networks and its applications in the open environments, the security techniques need to be more robust, reliable and flexible with the multistages and interfered secret keys capabilities. This research paper presents an efficient cryptography approach through constructing a cascaded series of processes. It proposes multi-Number of encrypting process (N-Round Chaos-based) crypto-system containing N-secret keys based on the type of data classifications and the environment. The paper also presents the simple criteria of the Number of Rounds (N-Round). The several chaos-based encryption techniques have been utilized to construct the proposed algorithm and various scenarios of the N-round mechanism over the different classified images have been presented. In the most related published papers, a vital two issue have been missed which are the criteria of the required and suitable security levels choosing and the rules and conditions of the robust security keys. These to essential issues have been discussed in this research paper. The various gray-scale images are used in the executed computer simulation experiments to demonstrate the robustness, reliability and applicability of the proposed cryptoalgorithm. The experiments are executed with the considering of presence the various attacks such as Speckle, salt & pepper and Gaussian noise. Based on the results using the standard database (Hlevkin, USA CANVAS), the proposed algorithm is robust and suitable in the presence noise/attack environment applications. As clarified form the results, The similarity of extracted images is 100% to the original plaintext for the no-presence attacks, while in presence of noise and attacks the similarity is >99%. The quality of the decrypted images is better than the most of existing cryptosystems.