Differential cryptanalysis

About: Differential cryptanalysis is a research topic. Over the lifetime, 2131 publications have been published within this topic receiving 54681 citations.

On the use of recurrent neural networks to design symmetric ciphers

Abstract: In this article, we describe an innovative form of cipher design based on the use of recurrent neural networks. The well-known characteristics of neural networks, such as parallel distributed structure, high computational power, ability to learn and represent knowledge as a black box, are successfully applied to cryptography. The proposed cipher has a relatively simple architecture and, by incorporating neural networks, it releases the constraint on the length of the secret key. The design of the symmetric cipher is described in detail and its security is analyzed. The cipher is robust in resisting different cryptanalysis attacks and provides efficient data integrity and authentication services. Simulation results are presented to validate the effectiveness of the proposed cipher design.

Design and Analysis of Stream Cipher for Network Security

Abstract: This paper mainly analysis and describe the design issue of stream ciphers in Network security as the streams are widely used to protecting the privacy of digital information. A variety of attacks against stream cipher exist;(algebraic and so on). These attacks have been very successful against a variety of stream ciphers. So in this paper efforts have been done to design and analyze stream ciphers. The main contribution is to design new stream ciphers through analysis of the algebraic immunity of Boolean functions and S-Boxes. In this paper, the cryptographic properties of non-linear transformation have been used for designing of stream ciphers Many LFSR (Linear feedback Shift Register) based stream ciphers use non-linear Boolean function to destroy the linearity of the LFSR(s) output. Many of these designs have been broken by algebraic attacks. Here we analyze a popular and cryptographically significant class of non-linear Boolean functions for their resistance to algebraic attacks.

On Modes of Operation

Abstract: In this paper we study the modes of operation in which a cryptosystem, and in particular DES, can be used. This study shows that attempts to complicate the modes of operation weaken (in many cases) the resultant modes. We conclude that operation modes should be designed around the underlying cryptosystem without any attempt to use intermediate data as feedback, or to mix the feedback into an intermediate round. Thus, in particular, triple-DES used in CBC mode is more secure than a single-DES used in triple-CBC mode. Alternatively, if several encryptions are applied to each block, the best choice is to concatenate them to one long encryption, and build the mode of operation around it.

The design of s-boxes by simulated annealing

Abstract: Substitution boxes are important components in many modern day block and stream ciphers. Their study has attracted a great deal of attention over many years. The development of a variety of cryptosystem attacks has lead to the development of criteria for resilience to such attacks. Some general criteria such as high nonlinearity and low autocorrelation have been proposed (providing some protection against attacks such as linear cryptanalysis and differential cryptanalysis). There has been little application of evolutionary search to the development of s-boxes. In This work we show how a cost function that has found excellent single-output Boolean functions can be generalised to provide improved results for small s-boxes.

Performance of block ciphers and hash functions — One year later

Abstract: – The NIST Secure Hash Algorithm (SHA) has been replaced with a new algorithm, SHA-1 [10]. The reason for this change is that NIST (or NSA) discovered an attack against the original SHA algorithm [11]. – This year’s measurements are based on a faster implementation of GOST 28147. – This year’s measurements were made with a different Sun workstation. The new machine is significantly slower; as a result, all the figures in the “Sparc” column of the tables have changed. – Some stream ciphers have been included. Many of the most interesting new algorithms in 1994 were stream ciphers. In particular, 1994 saw the publication of what were alleged to be the specifications of two proprietary stream ciphers, RC4 1 and A5.