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首页> 外文会议>4th ACM symposium on information, computer and communications security 2009 >A New Hash Family Obtained by Modifying the SHA-2 Family
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A New Hash Family Obtained by Modifying the SHA-2 Family

机译：通过修改SHA-2族获得一个新的哈希族

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摘要

In this work, we study several properties of the SHA-2 design which have been utilized in recent collision attacks against reduced round SHA-2. Small modifications to the SHA-2 design are suggested to thwart these attacks. The modified round function provides the same resistance to linearization attacks as the original SHA-2 round function, but, provides better resistance to non-linear attacks. Our next contribution is to introduce the general idea of "multiple feedforward" for the construction of cryptographic hash functions. This can provide increased resistance to the Chabaud-Joux type "perturbation-correction" collision attacks. The idea of feed-forward is taken further by introducing the idea of feed-forward across message blocks leading to resistance against generic multi-collision attacks. The net effect of the suggested changes to the SHA-2 design has insignificant impact on the efficiency of computing the digest.
机译：在这项工作中，我们研究了SHA-2设计的几个属性，这些属性已用于针对减少的圆形SHA-2的最近碰撞攻击中。建议对SHA-2设计进行少量修改以阻止这些攻击。修改后的舍入函数可提供与原始SHA-2舍入函数相同的抵抗线性化攻击的能力，但可提供更好的抵抗非线性攻击的能力。我们的下一个贡献是引入“多重前馈”的一般思想，以构造密码哈希函数。这可以增加对Chabaud-Joux类型的“扰动校正”碰撞攻击的抵抗力。前馈的思想通过引入跨消息块的前馈的思想得到了进一步的发展，从而导致了对通用多冲突攻击的抵抗。建议对SHA-2设计进行更改的最终结果对摘要计算效率没有显着影响。

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