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Building blockcipher from small-block tweakable blockcipher

机译:从小块可调整块密码构建块密码

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How to build a secure blockcipher is one of the central problems in symmetric cryptography. While the popular approach, initiated by the seminal paper of Luby and Rack-off, is based on a pseudorandom function, Minematsu (in: Dunkelman (ed.) FSE, 2009) and Minematsu and Iwata (in: Chen (ed.) IMA, 2011) proposed different schemes to efficiently achieve a better security. The point of these works is that they use tweakable blockcipher (TBC) as an internal module rather than pseudorandom function. This paper further extends the previous schemes and considers the case that the target blockcipher has much larger block size than that of the TBC we use. Assuming the tweak of TBC is long, we propose a scheme similar to unbalanced Feistel cipher that achieves stronger security than the previous schemes of Minematsu and Minematsu-Iwata. We also present a blockcipher-based instantiation of our scheme for the encryption over some unusual domains, such as decimal space, as a typical problem of format-preserving encryption.
机译:如何建立安全的分组密码是对称密码学的核心问题之一。虽然流行的方法是由Luby和Rack-off撰写的开创性论文提出的,但它是基于伪随机函数,Minematsu(in:Dunkelman(ed。)FSE,2009)和Minematsu and Iwata(in:Chen(ed。))IMA (2011年)提出了不同的方案,以有效地实现更好的安全性。这些工作的重点是它们使用可调整的分组密码(TBC)作为内部模块,而不是伪随机函数。本文进一步扩展了先前的方案,并考虑了目标分组密码具有比我们使用的TBC大得多的分组大小的情况。假设TBC的调整时间很长,我们提出了一种类似于不平衡Feistel密码的方案,该方案比以前的Minematsu和Minematsu-Iwata方案具有更高的安全性。我们还介绍了我们的方案的基于块密码的实例化,用于在某些异常域(例如十进制空间)上进行加密,这是格式保留加密的典型问题。

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