Paper 2016/1120

Cryptanalysis of Reduced round SKINNY Block Cipher

Sadegh Sadeghi and Tahere Mohammadi and Nasour Bagheri

Abstract

SKINNY is a family of lightweight tweakable block ciphers designed to have the smallest hardware footprint. In this paper, we present zero-correlation linear approximations and related-tweake impossible differential characteristics for different versions of SKINNY. We utilize meet-in-the-middle approach to construct 9-round and 10-round zero-correlation linear distinguisher. We also obtain 12-round related-tweakey impossible differential characteristics for both SKINNY-64 and 128 in TK1 model and TK2 model. To the best of our knowledge, the presented zero-correlation characteristics in this paper is the first investigation of the security of SKINNY against this attack.

Note: The current works only contains characteristics for SKINNY and we may revise it further by introducing new contents.