CRYPTANALYSIS OF CIKS-128 AND CIKS-128H SUITABLE FOR INTELLIGENT MULTIMEDIA AND UBIQUITOUS COMPUTING SYSTEMS

摘要

Recently, data-dependent permutations (DDP) that are very suitable for intelligent multimedia and ubiquitous computing systems have been introduced as a new cryptographic primitive for the design of fast encryption systems. The CIKS-128 and CIKS-128H block ciphers are the typical examples of DDP-based encryption algorithms. In this paper, we show that CIKS-128 and CIKS-128H are vulnerable to related-key differential attacks. We first describe how to construct their full-round related-key differential characteristics with high probabilities and then we exploit them to break the full-round CIKS-128 and CIKS-128H with 244, and 248 data/time complexities, respectively.