The AES Encryption algorithm (also known as the Rijndael algorithm) is a symmetric block cipher algorithm with a block/chunk size of 128 bits. It converts these individual blocks using keys of 128, 192, and 256 bits. Once it encrypts these blocks, it joins them together to form the ciphertext.
It is based on a substitution-permutation network, also known as an SP network. It consists of a series of linked operations, including replacing inputs with specific outputs (substitutions) and others involving bit shuffling (permutations).
In this tutorial, you will go through some of the standout features that AES offers as a globally standardized encryption algorithm.
Dear Alyaa Ghanim Sulaiman,
The data presented below may help you to understand the improvement paths in AES security enhancements:
https://www.researchgate.net/publication/323081584_Review_on_improvement_of_advanced_encryption_standard_AES_algorithm_based_on_time_execution_differential_cryptanalysis_and_level_of_security
https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Standards-and-Guidelines/documents/aes-development/NSA-AESfinalreport.pdf
https://www.semanticscholar.org/paper/An-improved-AES-encryption-algorithm-Li-Chen/bf94d5dcf15f30f4525a4e8bc1c1d992f398a9d7
https://www.rfwireless-world.com/Terminology/Advantages-and-disadvantages-of-AES.html
Dear Alyaa Ghanim Sulaiman
AES has proven to be very safe against differential and linear attacks, but very insecure against "side channels" attacks, specifically it is very weak against power attacks.
This weakness is due to the properties of its S-box since its actual power leakage during the evaluation of the S-box, can be modeled with high linear correlation, using the leakage model "Hamming weight".
For these reasons, to strengthen the AES I suggest replacing your S-box with others that maintain resistance to differential and linear attacks but increase resistance against power attacks.
The search or construction of such S-boxes, by various methods is an active area of research. Another approach to consider is to apply more than one S-box and change the new ones Dynamically, depending on the keys.
Best Regardss
Professor Carlos Miguel Legón Pérez.
DOI :
10.1109/ACCESS.2020.3035163
Evolving nonlinear S-boxes with improved theoretical resilience to power ATTACKS.
Alejandro Freyre-Echevarría, Ismel Martínez-Díaz, Carlos Miguel Legón Pérez, Guillermo Sosa-Gómez, Omar Rojas
IEEE Access 8, 202728-202737, 2020
Substitution boxes are the main nonlinear component of block ciphers. The security of these ciphers against linear, differential, or side-channel attacks is dependent on the design of such component and their intrinsic properties. There are several methods that aim to cryptographically define, generate, or search for strong substitution boxes. The application of combinatorial optimization algorithms is one of the most useful methodologies in this research area. In this article, we present a novel hybrid method based on the Leaders and Followers and hill-climbing over Hamming Weight Classes metaheuristics, coupled with a new trade-off fitness function that generates 8-bit bijective substitution boxes with good resisting properties towards classical cryptanalysis and side-channel attacks by power consumption. We address the best Pareto optimal solutions for the multi-objective optimization of non-linearity and confusion coefficient variance.
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