Publication

On the security of CS-Cipher

Serge Vaudenay
1999
Conference Papers

Abstract

CS-Cipher is a block cipher which has been proposed at FSE 1998. It is a Markov cipher in which diffusion is performed by multipermutations. We first provide a formal treatment for differential, linear and truncated differential cryptanalysis, and we apply it to CS-Cipher in order to prove that there exists no good characteristic for these attacks. This holds under the approximation that all round keys of CS-Cipher are uniformly distributed and independent. For this we introduce some new techniques for counting active Sboxes in computational networks by the Floyd-Warshall algorithm.

Official source

https://infoscience.epfl.ch/entities/publication/9b6c2c45-c10b-4862-a1c9-f94000572d19

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Serge Vaudenay
1999
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/9b6c2c45-c10b-4862-a1c9-f94000572d19

About this result

Related concepts (32)

Block cipher

In cryptography, a block cipher is a deterministic algorithm that operates on fixed-length groups of bits, called blocks. Block ciphers are the elementary building blocks of many cryptographic protocols. They are ubiquitous in the storage and exchange of data, where such data is secured and authenticated via encryption. A block cipher uses blocks as an unvarying transformation. Even a secure block cipher is suitable for the encryption of only a single block of data at a time, using a fixed key.

Cipher

In cryptography, a cipher (or cypher) is an algorithm for performing encryption or decryption—a series of well-defined steps that can be followed as a procedure. An alternative, less common term is encipherment. To encipher or encode is to convert information into cipher or code. In common parlance, "cipher" is synonymous with "code", as they are both a set of steps that encrypt a message; however, the concepts are distinct in cryptography, especially classical cryptography.

Differential cryptanalysis

Differential cryptanalysis is a general form of cryptanalysis applicable primarily to block ciphers, but also to stream ciphers and cryptographic hash functions. In the broadest sense, it is the study of how differences in information input can affect the resultant difference at the output. In the case of a block cipher, it refers to a set of techniques for tracing differences through the network of transformation, discovering where the cipher exhibits non-random behavior, and exploiting such properties to recover the secret key (cryptography key).

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