An Improved Genetic Algorithm and A New Discrete Cuckoo Algorithm for Solving the Classical Substitution Cipher

Abstract

Searching secret key of classical ciphers in the keyspace is a challenging NP-complete problem that can be successfully solved using metaheuristic techniques. This article proposes two metaheuristic techniques: improved genetic algorithm (IGA) and a new discrete cuckoo search (CS) algorithm for solving a classical substitution cipher. The efficiency and effectiveness of the proposed techniques are compared to the existing tabu search (TS) and genetic algorithm (GA) techniques using three criteria: (a) average number of key elements correctly detected, (b) average number of keys examined before determining the required key, and (c) the mean performance time. As per the results obtained, the improved GA is comparatively better than the existing GA for criteria (a) and (c), while the proposed CS strategy is significantly better than rest of the algorithms (i.e., GA, IGA, and TS) for all three criteria. The obtained results indicate that the proposed CS technique can be an efficient and effective option for solving other similar NP-complete combinatorial problems also.

Cryptoanalytic Method of Searching for the Secret Key and ITS Length on the Basis of Evolution Metaheuristics

“…Neural networks are a "powerful" device for approximating complex dependencies (Jain and Chaudhari, 2019). Most often, three types of networks are used: multilayer perceptron, a network based on radial basis functions and a support vector machine.…”

Особливості Застосування Алгоритму Асо До Деяких Задач Криптоаналізу

“…Джейн та ін. у [23] порівнювали Cuckoo Search та GA, досліджуючи атаки на шифри підстановки. Алгоритм, що імітує стра-тегію зграї дельфінів під час полювання, застосовували Амік та ін.…”

Огляд Застосування Метаевристичного Підходу В Криптоаналізі

“…Джейн та ін. у [28] порівнювали Cuckoo Search та GA, досліджуючи атаки на шифри підстановки. Алгоритм, що імітує стратегію зграї дельфінів під час полювання, застосовували Амік та ін.…”