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Miss in the Middle Attacks on IDEA and Khufu
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Miss in the Middle Attacks on IDEA and Khufu
Eli Biham5  , Alex Biryukov6 and Adi Shamir7
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Computer Science Department, Technion — Israel Institute of Technology, Haifa, 32000, Israel |
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Applied Mathematics Department, Technion — Israel Institute of Technology, Haifa, 32000, Israel |
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Department of Applied Mathematics and Computer Science, Weizmann Institute of Science, Rehovot, 76100, Israel |
Abstract
In a recent paper we developed a new cryptanalytic technique based on impossible differentials, and used it to attack the Skipjack encryption algorithm reduced from 32 to 31 rounds. In this paper we describe the application
of this technique to the block ciphers IDEA and Khufu. In both cases the new attacks cover more rounds than the best currently
known attacks. This demonstrates the power of the new cryptanalytic technique, shows that it is applicable to a larger class
of cryptosystems, and develops new technical tools for applying it in new situations.
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