Related-Key Differential Cryptanalysis of Midori-64 Based on Invariant Subspace

• Hongluan Zhao,
• Guoyong Han,
• Zhaohui Xing,

Vol. 18, No. 11, November 30, 2024
10.3837/tiis.2024.11.011, Download Paper (Free):

• Midori-64
• Related Key
• Invariant Subspace
• differential cryptanalysis

Abstract

Midori is a lightweight block ciphers presented by Banik et al. and the 128-bit master key K directly generates the round key RKi. We mostly focus on the related-key differential cryptanalysis on Midori-64. By analyzing the DDT of S-box, we find that some differences can remain the same with the high probability and obtain 2-round invariant subspace of Midori-64. Then, we find two 11-round related-key differential distinguishers for Midori-64 with the probability of 2−48 and 2−54. Using the second differential distinguisher, we present a 15-round related-key differential cryptanalysis on Midori-64 with data complexity of 255 and time complexity of 2108.11.

Statistics

Cite this article