Modified Version of Playfair Cipher using Linear Feedback Shift Register and Transpose Matrix Concept
Vinod Kumar1, Santosh Kr Upadhyay2, Satyam Kishore Mishra3, Devesh Singh4
1Vinod Kumar, Department of Computer Science and Engineering, Mewar University, Chittorgarh (Rajasthan), India.
2Santosh Kumar Upadhyay, Department of Computer Science and Engineering, Mewar University, Chittorgarh (Rajasthan), India.
3Sattyam Kishor Mishra, Department of Computer Science & Engineering, Meerut Institute of Engineering and Technology, Meerut (Uttar Pradesh), India.
4Davesh Singh, Department of Computer Science and Engineering, Meerut Institute of Engineering and Technology, Meerut (Uttar Pradesh), India.
Manuscript received on 11 June 2013 | Revised Manuscript received on 17 June 2013 | Manuscript Published on 30 June 2013 | PP: 257-261 | Volume-3 Issue-1, June 2013 | Retrieval Number: A0925063113/13©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: In this paper we are presenting a new technique for secure transmission of message by modified version of playfair cipher combining with random number generator and transpose of matrix concept. To develop such method of encryption technique we have used one of the simplest methods of random number generator called Linear Feedback Shift Register and Transpose Matrix concept has been used. The previous playfair cipher method is based on polyalphabetic cipher which is relatively easy to break because it leaves much of loop hole and a small hundreds of letters of cipher text are sufficient. Here we are generating random number sequences and placing it into 6X6 matrix. Then finding the transpose of it and mapping it to secret key of playfair cipher method. Corresponding number s will be transmitted to the receiver instead of alphabetic numeric key. This method increases security of the transmitted key over unsecured transmission media.
Keywords: Random number, Playfair Cipher, Poly-alphabetic-Numeric Cipher, Linear Feedback Shift Register.
Scope of the Article: Approximation and Randomized Algorithms