首页> 外文会议>Progress in Cryptology - INDOCRYPT 2006; Lecture Notes in Computer Science; 4329 >HCH: A New Tweakable Enciphering Scheme Using the Hash-Encrypt-Hash Approach
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HCH: A New Tweakable Enciphering Scheme Using the Hash-Encrypt-Hash Approach

机译:HCH:一种使用哈希-加密-哈希方法的新的可调整加密方案

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The notion and the first construction of a tweakable enciphering scheme, called CMC, was presented by Halevi-Rogaway at Crypto 2003. In this paper, we present HCH, which is a new construction of such a scheme. The construction uses the hash-encrypt-hash approach introduced by Naor-Reingold. This approach has recently been used in the constructions of tweakable enciphering schemes HCTR and PEP. HCH has several advantages over the previous schemes CMC, EME, EME~(*), HCTR, and PEP. CMC, EME, and EME~(*) use two block-cipher invocations per message block, while HCTR, PEP, and HCH use only one. PEP uses four multiplications per block, while HCTR and HCH use only two. In HCTR, the security bound is cubic, while in HCH security bound is quadratic.
机译:Halevi-Rogaway在Crypto 2003上提出了可调整加密方案称为CMC的概念和第一个结构。在本文中,我们介绍了HCH,它是这种方案的新结构。该构造使用Naor-Reingold引入的hash-encrypt-hash方法。最近,这种方法已用于可调整加密方案HCTR和PEP的构造中。与以前的方案CMC,EME,EME〜(*),HCTR和PEP相比,HCH具有多个优点。 CMC,EME和EME〜(*)对每个消息块使用两次块密码调用,而HCTR,PEP和HCH仅使用一次。 PEP每块使用四个乘法,而HCTR和HCH仅使用两个。在HCTR中,安全范围是三次,而在HCH中,安全范围是二次。

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