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| Integral Cryptanalysis of Reduced Round FOX64 |
| Guo Rui Jin Chen-hui |
| (The Third Institute, PLA Information Engineering University, Zhengzhou 450001, China) |
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Abstract FOX family block ciphers are based on Lai-Massey scheme. Firstly, the evaluation is performed on the ability of the reduced round FOX64 to resist zero-correlation linear cryptanalysis, and some 4-round zero- correlation linear distinguishers are presented. Then, by using the relation between the integral distinguishers and zero-correlation distinguishers, the 4-round integral distinguishers of FOX64 are found. Finally, the 4-round integral distinguishers are used to attack 5, 6, 7 and 8 rounds FOX64 with the time complexity of 252.7, 2116.7, 2180.7 and 2244.7 encryptions respectively, and the data complexity is 250 chosen plaintexts. This is the first paper pointing out that 8-round FOX64/256 is vulnerable against the statistical attack.
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Received: 19 March 2014
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Corresponding Authors:
Guo Rui
E-mail: guorui201@sohu.com
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2015, Vol. 37 
