Key Transformation Approach for Rijndael Security

Sulong, Mek Rahmah (2008) Key Transformation Approach for Rijndael Security. Masters thesis, Universiti Putra Malaysia.

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Abstract

Rijndael is a block cipher designed by Joan Daemen and Vincent Rijmen in 1999. It is a combination of security, performance, efficiency, implementability and flexibility that makes it the best selection for Advanced Encryption Standard (AES). However, the 128- bit Rijndael Key Schedule does not satisfy the frequency (bit confusion) test for majority of Subkeys and does not satisfy the avalanche (bit diffusion) test for any Subkeys. These contribute to some attacks in the Key Schedule. Thus, a new transformation method which is called "ShiftRow" is proposed into the 128-bit Rijndael Key Schedule based upon information principles (bit confusion and diffusion properties). The new method shifts the rows of the Rijndael Subkey after the RCon function is being applied to the Subkey. This method improves the security of Rijndael Key Scheduling by increasing the bit confusion and diffusion of the Rijndael Subkey. The new method has shown positive results in terms of the bit confusion and diffusion of Subkey and it has increased bit confusion and diffusion compared to the Subkey of the original Rijndael Key Schedule.

Item Type:Thesis (Masters)
Subject:Data encryption (Computer science).
Chairman Supervisor:Associate Professor Ramlan Mahmod, PhD
Call Number:FSKTM 2008 3
Faculty or Institute:Faculty of Computer Science and Information Technology
ID Code:5895
Deposited By: Nur Izyan Mohd Zaki
Deposited On:05 May 2010 08:26
Last Modified:27 May 2013 07:25

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