基于共享密钥的伪概率加密方法与算法

Q3 Mathematics
A. Moldovyan, N. Moldovyan
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引用次数: 1

摘要

作为在潜在的强制攻击情况下通过公共通道发送的消息提供安全的一种方法,已经提出了可否认加密的算法和协议。最后分为以下几种类型:1)具有公钥的方案,2)具有共享密钥的方案,以及3)无密钥方案。引入了伪概率对称密码,表示实现可否认加密算法的特定变体。讨论了伪概率加密在构建包含隐藏在密文中的隐写信道的特殊信息保护机制中的应用。有一些设计流和块伪概率加密算法的考虑方法,这些算法可以同时对假消息和秘密消息进行加密,从而使生成的密文与作为假消息概率加密的输出而获得的密文在计算上无法区分。密文与概率加密的不可区分性被作为设计标准之一。为了在伪概率密码的构造方案中实现这一准则,将假消息和秘密消息的中间密文块双射映射到输出密文的单个扩展块中。本文还考虑了恢复假消息和秘密消息的算法完全一致的伪概率分组密码的实现。提出了构造无密钥加密协议和随机伪概率分组密码的一般方法。给出了这类密码方案的具体实现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Methods and Algorithms for Pseudo-probabilistic Encryption with Shared Key
As a method for providing security of the messages sent via a public channel in the case of potential coercive attacks there had been proposed algorithms and protocols of deniable encryption. The lasts are divided on the following types: 1) schemes with public key, 2) schemes with shares secret key, and 3) no-key schemes. There are introduced pseudo-probabilistic symmetric ciphers that represent a particular variant of implementing deniable encryption algorithms. It is discussed application of the pseudo-probabilistic encryption for constructing special mechanisms of the information protection including steganographic channels hidden in ciphertexts. There are considered methods for designing stream and block pseudo-probabilistic encryption algorithms that implement simultaneous ciphering fake and secret messages so that the generated ciphertext is computationally indistinguishable from the ciphertext obtained as output of the probabilistic encryption of the fake message. The requirement of the ciphertext indistinguishability from the probabilistic encryption has been used as one of the design criteria. To implement this criterion in the construction scheme of the pseudo-probabilistic ciphers it is included step of bijective mapping pairs of intermediate ciphertext blocks of the fake and secret messages into a single expanded block of the output ciphertext. Implementations of the pseudo-probabilistic block ciphers in which algorithms for recovering the fake and secret messages coincide completely are also considered. There are proposed general approaches to constructing no-key encryption protocols and randomized pseudo-probabilistic block ciphers. Concrete implementations of the cryptoschemes of such types are presented.
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来源期刊
SPIIRAS Proceedings
SPIIRAS Proceedings Mathematics-Applied Mathematics
CiteScore
1.90
自引率
0.00%
发文量
0
审稿时长
14 weeks
期刊介绍: The SPIIRAS Proceedings journal publishes scientific, scientific-educational, scientific-popular papers relating to computer science, automation, applied mathematics, interdisciplinary research, as well as information technology, the theoretical foundations of computer science (such as mathematical and related to other scientific disciplines), information security and information protection, decision making and artificial intelligence, mathematical modeling, informatization.
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