中文摘要：

通过对SHA-3算法置换函数Keccak-f的线性性质以及缩减轮数的Keccak杂凑函数原象攻击的研究,提出了SHA-3算法的抗原象攻击性能优化设计方案.首先结合Keccak杂凑函数的差分特点和θ置换函数的奇偶性质,分析了基于CP-kernel的SHA-3算法原象攻击;然后针对目前实施原象攻击的方法,在θ置换函数运算后异或随机数以打乱其汉明重量,改变CP-kernel的校验性质,阻止攻击者利用中间相遇的方法寻找原象,提高了SHA-3算法的抗原象攻击能力;最后利用VHDL硬件语言实现抗原象攻击SHA-3算法的设计方案,验证了该算法的正确性以及安全性.

英文摘要：

By analyzing the linear property of Keccak-fpermutation functions of SHA-3algorithm and the round-reduced preimage attack of Keccak hash function,an optimization of preimage resistance on SHA-3algorithm is proposed.Firstly,we combine the differential property of Keccak algorithm and even parity ofθpermutation function,and analyze the preimage resistance of SHA-3algorithm based on CP-kernel.Secondly,according to the current preimage attack methods on SHA-3algorithm,the output ofθpermutation function XOR random numbers are used to change Hamming weight and to improve the properties of CP-kernel.It prevents an attacker from using meet-in-themiddle method to find the preimage.Finally,the scheme has been implemented with VHDL hardware language.And,the results show that the encryption process has a good performance and high security.