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This paper proposes two measures for the evaluation of permutation techniques used in image encryption. First, a general mathematical framework for describing the permutation phase used in image encryption is presented. Using this framework, six different permutation techniques, based on chaotic and non-chaotic generators, are described. The two new measures are, then, introduced to evaluate the effectiveness...
This paper introduces two generalized tent maps where the conventional map is a special case. Although the output of the conventional tent map shows different responses, it has only one control parameter that limits its behavior and applications. The proposed generalized tent maps increase the degrees of freedom and produce a versatile response that can fit many applications. The characteristics of...
This paper presents a novel method for designing a pseudo random keystream generator (PRKG) based on fractal images. Although a fractal image has high correlation between its pixels, the proposed technique succeeds in almost eliminating this correlation and the output stream passes the NIST statistical test suite. The post-processing on the fractals is based only on a confusion process and uses a...
This paper presents a new encryption scheme based on the combination between Linear Feedback Shift Register (LFSR) and generalized Feistel networks (GFN). The construction of each GFN depends on Substitution Boxes (S-Boxes) and its operation requires a key. The encryption key length is dynamic and can be controlled via the initial values of the LFSR, S-Boxes, and the number of GFN stages. The performance...
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