Impossible Differential Attacks on 13-Round CLEFIA-128 |
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| Authors: | Hamid Mala Mohammad Dakhilalian Mohsen Shakiba |
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| Affiliation: | (1) State Key Laboratory of Information Security, Institute of Software, Chinese Academy of Sciences, Beijing, 100190, China;(2) State Key Laboratory of Information Security, Graduate University of Chinese Academy of Sciences, Beijing, 100049, China |
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| Abstract: | CLEFIA, a new 128-bit block cipher proposed by Sony Corporation, is increasingly attracting cryptanalysts’ attention. In this
paper, we present two new impossible differential attacks on 13 rounds of CLEFIA-128. The proposed attacks utilize a variety
of previously known techniques, in particular the hash table technique and redundancy in the key schedule of this block cipher.
The first attack does not consider the whitening layers of CLEFIA, requires 2109.5 chosen plaintexts, and has a running time equivalent to about 2112.9 encryptions. The second attack preserves the whitening layers, requires 2117.8 chosen plaintexts, and has a total time complexity equivalent to about 2121.2 encryptions. |
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