A New Feistel-Type White-Box Encryption Scheme

A New Feistel-Type White-Box Encryption Scheme
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一种新的Feistel型白盒加密方案

DOI:
10.1007/s11390-017-1727-x
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发表时间:
2017-03
影响因子:
0.7
通讯作者:
Jia Yin
Jia Yin
中科院分区:
--
文献类型:
--
作者:
Lin Ting-Ting;Lai Xue-Jia;Xue Wei-Jia;Jia Yin

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白盒攻击是一种新的攻击环境,其中假设加密软件在不可信的平台上实现,并且所有实现细节都由攻击者控制。到目前为止,几乎所有的白盒解决方案都被打破了。在这项研究中,我们提出了一个白盒加密方案,这不是混淆现有密码的变体,而是一个全新的解决方案。新方案基于非平衡Feistel网络和ASASASA(其中“A”表示仿射,“S”表示替换)结构。它具有可选的输入块大小,并且与其他解决方案相比适合于节省空间,因为空间需求随着块大小的增长而缓慢(线性)增长。此外,我们的计划不仅有巨大的白盒多样性和白盒模糊性,但也有一个特殊的结构,以绕过公共白盒密码分析技术,包括针对现有密码的白盒变体的攻击和特定的ASASASA结构的攻击。更准确地说,我们提出了一个关于等价密钥的白盒安全性的定义,并证明了我们的方案满足这样的安全要求。
The white-box attack is a new attack context in which it is assumed that cryptographic software is implemented on an un-trusted platform and all the implementation details are controlled by the attackers. So far, almost all white-box solutions have been broken. In this study, we propose a white-box encryption scheme that is not a variant of obfuscating existing ciphers but a completely new solution. The new scheme is based on the unbalanced Feistel network as well as the ASASASA (where “A” means affine, and “S” means substitution) structure. It has an optional input block size and is suitable for saving space compared with other solutions because the space requirement grows slowly (linearly) with the growth of block size. Moreover, our scheme not only has huge white-box diversity and white-box ambiguity but also has a particular construction to bypass public white-box cryptanalysis techniques, including attacks aimed at white-box variants of existing ciphers and attacks specific to the ASASASA structure. More precisely, we present a definition of white-box security with regard to equivalent key, and prove that our scheme satisfies such security requirement.
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