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| Security evaluation for a class of generalized feistel ciphers |
| Wu Wenling; He Yeping |
| State Key Lab of Info. Security Institute of Software; CAS Beijing 100080 China;Eng. Research Center for Info. Security Technology China |
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Abstract This paper studies the security evaluation against differential and linear attacks for a class of generalized Feistel ciphers. If the round function is bijective and its maximum differential and linear characteristic probabilities are p and q, then the upper bounds of maximum differential and linear characteristic probabilities for 16-round ciphers are p7 and q7. If the round function is bijective and SP structure, the maximum differential and linear characteristic probabilities of S-boxes are pS and qS, the branch number of P is Pd, then the upper bounds of maximum differential and linear characteristic probabilities for 16-round ciphers are (pS)3Pd+1 and (qS)3Pd+1.
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Received: 08 October 2000
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2002, Vol. 24 
