Abstract
CIKS-128 and CIKS-128H are 128-bit block ciphers with a 256-bit key sizes based on data-dependent operations, respectively. They are also fast hardware-oriented ciphers and improvements of block cipher CIKS-1 introduced in [14]. This paper presents related-key differential attacks on full-round CIKS-128 and CIKS-128H. In result, using full-round related-key differential characteristics with probability 2-36 and 2-35.4, these attacks can recover the partial subkey bits for CIKS-128 and CIKS-128H with about 240 plaintexts, respectively. These works suggests that the greatest possible care has to be taken when proposing improvements of the existing block ciphers. © Springer-Verlag 2004.
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Ko, Y., Lee, C., Hong, S., Sung, J., & Lee, S. (2004). Related-key attacks on DDP based ciphers: CIKS-128 and CIKS-128H. Lecture Notes in Computer Science (Including Subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 3348, 191–205. https://doi.org/10.1007/978-3-540-30556-9_16
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