An approach to Improving Columnar Permutation Cipher for Wills in Distributed Systems of Law Firms

Abstract

With the evolution of cryptography in the twentieth century, classical ciphers (transposition ciphers) are gradually being pushed out because it now possesses low security ratings, however we can still salvage them, as they have other desirable and admirable qualities which include: easy of design, medium technical know-how and low computational power and it is to achieve this that this study; “A three layer permutation Cryptosystem using a modification of Transposition cipher and two layers content permutation for Wills” was carried out . The aim of this study is to make columnar transposition more secure and relevant so that companies with low technology budget and know-how be secured from known cryptosystem attack. The method used to achieve the above aim is adding to columnar transposition the technique of rail cipher, this affected the sequence of transposition, and lead to a new encryption equation and function. Cryptanalysis was carried out using various tools (Cryptool 2, Dcode and Countwordsfree) and parameters, using a transposition decoder the cipher text gotten using the traditional transposition cryptosystem decrypted with a hundred percent word and character accuracy whilst using the improved system gave a thirty percent accuracy.