Mathematical Methods of Cryptography

On the reduction of the XEH block cipher mode to ECB mode in the chosen-plaintext attack model

D. A. Zakharov, A. B. Chuhno


Abstract: Introduced in 2022 as a security-enhanced modification of XTS mode with improved operational properties compared with the standardized DEC mode, the XEH block cipher mode is designed for full-disk encryption systems. In this paper, we demonstrate its reducibility to ECB mode under chosen-plaintext attacks. The proposed method has time complexity $O((n+1) 2^{l})$ and succeeds with probability 1.

Keywords: block cipher mode, full-disk encryption, chosen-plainext attack.

UDC: 519.7

DOI: 10.17223/2226308X/18/27