Journal of Mathematics and Statistics

The New Variable-Length Key Symmetric Cryptosystem

Davood Rezaei Pour, Mohamad Rushdan Md Said, Kamel Ariffin Mohd Atan and Mohamed Othman

DOI : 10.3844/jmssp.2009.24.31

Journal of Mathematics and Statistics

Volume 5, Issue 1

Pages 24-31

Abstract

Problem statement: In this study, we proposed a new 64-bit block cipher that accepted a variable-length key up to 512 bits, which was suitable for implementation in a variety of environments. Approach: The cipher algorithm was a 16-round Feistel network with a bijective function f and was made up of two key-dependent 16×16 S-boxes, bitwise rotations, and a carefully designed key schedule. Results: The block cipher, what we called NBC08, was designed to perform under the powerful operations supported in today’s computers, resulting in an improved security/performance tradeoff over existing block ciphers. Conclusion: The study concluded the differential, linear and algebraic cryptanalysis on the NBC08 and showed that the cipher cannot be analyzed by any cryptanalytic attack. The statistical test results for NBC08 did not indicate a deviation from random behavior.

Copyright

© 2009 Davood Rezaei Pour, Mohamad Rushdan Md Said, Kamel Ariffin Mohd Atan and Mohamed Othman. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.