Ashok K. Bhateja

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Vigenere cipher is a polyalphabetic substitution cipher with a very large key space. In this paper we have investigated the use of PSO for the cryptanalysis of vigenere cipher and proposed PSO with Markov chain random walk in which some of the worst particles are replaced with new better random particles to enhance the efficiency of PSO algorithm. Based on(More)
Evolutionary techniques such as Genetic Algorithm (GA), Particle Swarm Optimization (PSO) and Cuckoo Search (CS) are promising nature-inspired meta-heuristic optimization algorithms. Cuckoo Search combined with Lévy flights behavior and Markov chain random walk can search global optimal solution very quickly. The aim of this paper is to investigate the(More)
Lately researches are going on to combine both cryptography and biometric systems for more reliability and security of a system. It can be accomplished using fuzzy vault technique. Fuzzy vault stores the secret key. Unlocking phase of fuzzy vault is based on construction of polynomial over a finite field system GF(2<sup>n</sup>). As the size of a key(More)
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