Security Analysis of Lightweight Block Ciphers ANU-II and LiCi
Resumen
ANU-II is a lightweight encryption design with 64-bit block and 80/128 bits key size which is proposed
as smallest lightweight design. LiCi is a low-power lightweight block cipher with a 64-bit block and
128-bit key size. Designers have provided a proof of security for differential attack on these ciphers. In
this paper, we analyse the security of ANU-II and LiCi to provide the accurate bounds for differential
attack. We apply branch-and-bound-based algorithm to search the differential trail. We construct
the optimal differential trails for 12 rounds and RK differential trails for 13 rounds of ANU-II that
require 262 and 263 chosen plaintext pairs respectively. We also search for the differential trail of
LiCi up to 11 rounds with probability 2−67 to give accurate security bounds for this attack. Our
results are better than the security bounds claimed by the designers. Our analysis provides the best
results available so far for a differential attack on ANU-II and differential cryptanalysis of LiCi.
Descargas
Derechos de autor 2025 Boletim da Sociedade Paranaense de Matemática
Esta obra está bajo licencia internacional Creative Commons Reconocimiento 4.0.
When the manuscript is accepted for publication, the authors agree automatically to transfer the copyright to the (SPM).
The journal utilize the Creative Common Attribution (CC-BY 4.0).
