

Articles
by
Wasan S. Awad 
Total Records (
2 ) for
Wasan S. Awad 





Yousif AlBastaki
and
Wasan S. Awad


The proposed system considers a new approach to cryptanalysis based on the application of a directed random search algorithm called genetic algorithm (GA). It uses GA to attack stream ciphers knowing part of plaintext, i.e., knownplaintext attack. GA attacks a stream cipher system by determining the equivalent Linear Feedback Shift Register of minimum length that generates the known keystream. Thus, in this work, we attempt to find the linear equivalence of a given keystream.The proposed algorithm provides the attacker with the following information: the initial state of the Linear Feedback Shift Register (LFSR), the characteristic polynomial defined as a feedback function of the LFSRandthe length of the register, i.e., the number of its stages. The aim of this work is to study the applicability of GA in finding the linear equivalence. 




Wasan S. Awad


Any linear block code can be determined by a number of parameters, the important one, that determines the detection/correction capability of the code, is the minimum weight. The determination of minimum weight for a given linear block code is a complex process. Thus, in this study a new method for determining this parameter is proposed which is based on the Genetic Algorithm. Two representation schemes are used and analyzed. The first one requires the use of the generator matrix of a linear block code and the second uses the parity check matrix. 





