Doctorat
Permanent URI for this collectionhttps://dspace.univ-boumerdes.dz/handle/123456789/46
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Item DNA-based encryption protocols for text and image confidentiality(Université M'Hamed Bougara Boumerdès : Faculté des Sciences, 2026) Goudjil, Aya; Hamadouche, M'Hamed(Directeur de thèse)The advancement of technology has accelerated rapidly in recent years, becoming deeply integrated into everyday human life, where even simple tasks increasingly rely on digital systems. Along with this expansion, the rise of cyberattacks has made the development of new cryptographic techniques a necessity, evolving in response to emerging security challenges. Cryptography is the art of securing information through mathematical transformations, and researchers continuously explore new concepts and techniques to enhance data protection. Among these approaches, bio-inspired encryption schemes have gained significant attention, particularly DNA cryptography, a promising emerging technology that exploits the characteristics of DNA molecules, including parallelism, high information density, and complexity. In parallel, chaotic dynamics has also secured an important position in the cryptographic domain due to its sensitivity to initial conditions, unpredictability, and deterministic behavior, making it suitable for use in encryption processes as well as for achieving effective diffusion and confusion. This thesis proposes new DNA-based encryption schemes that provide improved resistance against brute-force, differential, and statistical attacks. The first scheme focuses on securing textual data by incorporating DNA encryption techniques with the fundamental building block of symmetric ciphers, namely the Feistel network, and is compared with well-known ciphers such as DES, 3-DES, AES, Blowfish, Twofish, CAST, and Camellia. The second scheme addresses RGB image encryption using a hybrid method that combines a logistic chaotic map with DNA encryption and is evaluated in comparison with existing research. Both methods are validated through testing using different cryptographic security metrics, demonstrating competitive results when compared to existing approaches. In security, there is no fully secure cryptographic technique, even with in-depth analysis, new weaknesses or attacks may be discovered over time. Therefore, the limitations of the proposed studies are discussed in this thesis, along with new perspectives and future research directions related to this work. In summary, the field of DNA cryptography is a promising research area for achieving enhanced data security and developing robust encryption mechanisms for future applications