An integrated symmetric key cryptography algorithm using Generalised Modified Vernam Cipher method and DJSA method: DJMNA symmetric key algorithm

In the present work the authors have introduced an integrated symmetric key cryptographic method DJMNA which combine two independent methods (i) Modified Generalized Vernam Cipher (MGVC) method and (ii) DJSA method which is an extension of MSA method. The Generalized Vernam Cipher algorithm extends text encryption to any type of data encryption. This is done by using ASCII code of all characters (0-255). This modified version of Generalized Vernam Cipher uses “feedback” effect and also reverses the file while encryption. This makes the encryption process very hard to decrypt by using any brute force method. It was found that the encrypted text has huge difference for similar plaintexts having minor difference even for the same text-key. From this text key two randomized matrices are generated. The elements of this matrix decides the order of application of DJSA and MGVC methods.