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MJH: a faster alternative to MDC-2

机译:MJH:MDC-2的更快替代品

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In this paper, we introduce a new class of double-block-length hash functions. Using the ideal cipher model, we prove that these hash functions, dubbed MJH, are asymptotically collision resistant up to query complexity for any in the iteration, where is the block size of the underlying blockcipher. When based on -bit key blockciphers, our construction, being of rate 1/2, provides better provable security than MDC-2, the only known construction of a rate-1/2 double-length hash function based on an -bit key blockcipher with non-trivial provable security. Moreover, since key scheduling is performed only once per message block for MJH, our proposal significantly outperforms MDC-2 in efficiency. When based on a -bit key blockcipher, we can use the extra bits of key to increase the amount of payload accordingly. Thus we get a rate-1 hash function that is much faster than existing proposals, such as Tandem-DM with comparable provable security. This is the full version of Lee and Stam (A faster alternative to MDC-2, 2011).
机译:在本文中,我们介绍了一类新的双块长哈希函数。使用理想的密码模型,我们证明了这些被称为MJH的哈希函数在任何迭代中都具有渐近抗冲突性,直到查询复杂为止,其中底层分组密码的块大小为。当基于-bit密钥分组密码时,我们的速率为1/2的构造比MDC-2提供更好的可证明的安全性,MDC-2是基于-bit密钥分组密码的唯一已知的rate-1 / 2双重长度哈希函数的构造具有非平凡的可证明安全性。此外,由于对于MJH,每个消息块仅执行一次密钥调度,因此我们的建议在效率上明显优于MDC-2。当基于-bit密钥分组密码时,我们可以使用key的额外位来相应地增加有效负载量。因此,我们得到的rate-1哈希函数比现有建议(例如具有可证明的安全性的Tandem-DM)要快得多。这是Lee and Stam的完整版(2011年MDC-2的更快替代品)。

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