Document Type : Research Paper


Computer Science Dept., University of Technology - Iraq


The cryptographic algorithms became the main proceeding for protection of very important data from unauthorized access. There are several cryptographic algorithms to ensure the data, but algorithms must be selected according to speed, strength and the implementation. Thus, choosing the advance encryption standard (AES) for encryption and decryption data because its speed and strength of encryption, flexible, complex processing and its resistance to Brute-force attack. This paper presents enhancement of the AES algorithm to increase the security of the encrypted documents by using different sizes data matrices based on multiple irreducible polynomials with order 2, 4, and 8. The proposed modifications results tested and provide a high randomness.


Main Subjects

[1] A. Rukhin, et al. “A Statistical Test Suite for
Random and Pseudorandom Number Generators
for Cryptographic Applications (revised),” Natl.
Inst. Stand. Technol.(US) Spec. Publ, 2008.
[2] F.Y. Mohammad, A.E. Rohiem and A.D.
Elbayoumy, “A Novel S-box of AES Algorithm
Using Variable Mapping Technique,”
International Conference on Aerospace Sciences
& Aviation Technology, ASAT- 13, May 26 –
28, 2009.
[3] H. Razi, and H.H. Seyyed. “Using cipher
key to generate dynamic S-box in AES cipher
system,” International Journal of Computer
Science and Security (IJCSS), 2012.
[4] L. Scripcariu, and M.D. Frunza. “Modified
Advanced Encryption Standard,” 11th
International Conference on Development and
Application Systems, Romania, 2012.
[5] N.H. Ali, S.R. Abdul Monem, and A. Jaber.
“Encryption using Dual Key Transformation
based on Creation of Multi S-Boxes in AES
Algorithm,” International Journal of Computer
Applications, 2013.
[6] K. Pravin, et al. “Modified Advanced
Encryption Standard,” International Journal of
Soft Computing and Engineering (IJSCE), 2014.
[7] W. Stallings, “'Cryptography and Network
Security,” 4th Edition, Prentice-Hall, 2005.