Title: On generating new key dependent XOR tables to improve AES security and evaluating the randomness of the output of block ciphers

Authors: Tran Thi Luong; Hoang Dinh Linh

Addresses: Academy of Cryptography Techniques, No. 141 Chien Thang Road, Tan Trieu, Thanh Tri, Hanoi, Vietnam ' Institute of Cryptographic Science and Technology, No. 105, Nguyen Chi Thanh Road, Lang Ha, Dong Da, Hanoi, Vietnam

Abstract: Although block ciphers are widely used and are quite secure, there are still many types of attacks against components of block ciphers, and the Advanced Encryption Standard (AES) block cipher is no exception. To improve the security of AES, there have been many studies in the literature on methods of making this block cipher dynamic. There have been many works focused on the methods of making dynamic at the S-box and the MixColumn transformation of AES. In this paper, we propose a method to make dynamic at the Addroundkey transformation of AES using new key dependent XOR tables. We also propose a procedure to evaluate the randomness of the output of a block cipher and apply this procedure to evaluate the randomness of the modified AES block cipher using new XOR tables. The proposed dynamic method based on new XOR tables can help improve the security of the AES block cipher against many of today's strong attacks on block ciphers.

Keywords: XOR table; Advanced Encryption Standard; AES; modified AES; randomness assessment.

DOI: 10.1504/IJICS.2024.136710

International Journal of Information and Computer Security, 2024 Vol.23 No.1, pp.16 - 39

Received: 12 Oct 2022
Accepted: 20 Mar 2023
Published online: 19 Feb 2024 *

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