GUESMIA, Seyf EddineSupervisor: BOUDERAH, BrahimSupervisor: ASSAS, Ouarda2023-05-112023-05-112016-06-10http://dspace.univ-msila.dz:8080//xmlui/handle/123456789/37964The Cryptology is the most indispensabte science used in the guarantee of the confidentiality of the exchanged information. It consist of creating and studying algorithms that secure the transnission over the intemet. A new algorithrn appeared in 2011, similar to the ariginal AES algorithm, provides more security by enhancing the reliability against the brute force attack. How6ver, it cannot handle the heavy encryption-processing load with the existence of the modern ressurce-limited systems. Our work presents an improvement design of 512-bit AES *lgorithm that provides high security level and ameliorates the prfonnance by minimizing the use of memory space and time eacryption to be able to work in specific characteristics of resourceJ imited systemsenCryptogmphy, Confidentiality, resourcelimited systemsThesis