A basic task of cryptography is the transformation, or encryption, of a given message into
another message which appears meaningful only to the intended recipient through the …

Among the most important components of many contemporary ciphers are the substitution
boxes (S-boxes) and a great amount of research is devoted to their study. In this paper, a …

During the past decade, considerable improved versions of real particle swarm optimisation
(PSO) have been proposed in the literature. However, only a few significant improved …

Algorithms (GA) are used for the cryptanalysis of many well known ciphers. However most of
the Cryptanalytic attacks using GA are sequential. We have taken Knapsack Cipher for our …

Recent cryptosystems constitute a hard task for cryptanalysis algorithms due to the
nonlinearity of their structure. This problem can be formulated as NP-hard. It has long been …

Cryptography nowadays is a very important field of protecting information from falling into
wrong hands. One of modern cryptography branch is stream cipher cryptography. This paper …

In the era of global informatization, transmitting and storing information in digital form it is
very important to ensure an adequate level of security of ciphers used. Cryptanalysis deals …

Modern ciphers constitute a challenge task for cryptanalysis algorithms due to their diversity
and nonlinearity. This problem can be formulated as NP-Hard. It has long been subject to …

This chapter contains papers presented in a session on “Computational Approaches to
Artificial Intelligence" at the International Conference of Computational Methods in Sciences …

Modern ciphers constitute a challenge for cryptanalysis algorithms given their diversity and
nonlinearity. This problem has long been subject to various attacks by classical techniques …