Meet-in-the-Middle Technique for Integral Attacks against Feistel Ciphers
作者： Yu Sasaki , Lei Wang
DOI: 10.1007/978-3-642-35999-6_16
关键词:
摘要: In this paper, an improvement for integral attacks against Feistel ciphers is discussed. The new technique can reduce the complexity of key recovery phase. This possibly leads to extension number attacked rounds. attack, attacker guesses a part round keys and performs partial decryption. correctness guess judged by examining whether XOR sum results becomes 0 or not. it shown that computation decryptions be divided into two independent parts if analysis target adopts network its variant. Then, correct candidates are efficiently obtained with meet-in-the-middle approach. effect our demonstrated several ciphers. Improvements on LBlock, HIGHT, CLEFIA presented. Particularly, rounds extended LBlock.
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