CHAOS-BASED DATA ENCRYPTION USING ARNOLD’S CAT MAP
Continuous Automorphism of the Torus (CAT) is a group of algebraic functions and are typically used in chaos-based encryption applications. Arnold’s CAT Map is one of the known CAT calculations. The most charming property of Arnold’s CAT Map is a number of repetitions of permutations eventually returns the array into the initial state. The number of repetition to return to the initial state is a function of array dimensions and mapping parameter, unquestionably it is chaotic as well. Utilization of Arnold’s CAT Map in encryption is common especially in image encryption and it is generally preferred for its time efficiency when compared with classical block cipher alternatives. Although substitution and permutation are two essential properties of an encryption algorithm, CAT maps are criticized for conducting permutation only. In this study an encryption algorithm that makes use of Arnold’s CAT Map calculation is proposed and its cryptographic properties are presented.
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