A Block Cipher using an Iterative Method involving a Permutation. (4th May 2015)

• Record Type: Journal Article
• Authors: Susarla, Lakshmi Bhavani Madhuri; Kumar, S. Udaya
• Is Part Of: Journal of discrete mathematical sciences & cryptography. Volume 18:Number 3(2015)
• Page Start: 275
• Page End: 292
• Publication Date: 2015-05-04
• Subjects: Computer science -- Mathematics -- Periodicals; Cryptography -- Periodicals; Computer science -- Mathematics; Cryptography; Periodicals; 004.0151
• DOI: 10.1080/09720529.2014.962853
• Languages: English
• ISSNs: 0972-0529

Abstract

Abstract: In this paper, we have developed a block cipher for a block of size 56 bits by using an iterative method involving a permutation. Here we have represented the plaintext as a matrix containing a pair of column vectors comprising binary bits. In the process of encryption, we have used a key matrix ( K ), which also consists of binary bits. For decryption, we have used the modular arithmetic inverse ( K −1 ) of the key matrix K . In this, we have discussed the cryptanalysis, and have shown that the cipher cannot be broken by any cryptanalytic attack. Finally, the analysis of the cipher is extended to a block of size 112 bits.