A NOVEL BLOCK CIPHER INVOLVING KEYS IN A KEY BUNCH MATRIX AS POWERS OF THE PLAINTEXT ELEMENTS

K. Anup Kumar, V.U.K Sastry

Abstract: In this analysis, we have developed an asymmetric block cipher which is involving a key bunch matrix A ( = [aij]) in the process of encryption, and B ( = [bij]) in the process of decryption. The keys aij are used as powers of the plaintext elements, and the keys bij are used as the powers of the ciphertext elements. Here, we have made use of Euler’s totient function and Euler’s theorem in the development of the cipher. The cryptanalysis clearly shows that the strength of the cipher is quite significant.

Keywords: Encryption, Decryption, Key, Plaintext, Cipher text and Cryptanalysis.

DOI: https://doi.org/10.15623/ijret.2014.0302123