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Author: search.filters.author.Klomkarn, KitdakornSubject: search.filters.subject.Chen system

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    Image encryption based on chaotic map and dynamic S-box
    (2013-12-01)
    Hung, Pham Anh
    ;
    Klomkarn, Kitdakorn
    ;
    Sooraksa, Pitikhate
    Dynamic substitution box (S-box) constructed from chaotic map is known as the secure improvement of classic S-box. But the general property '1 to 1' mapping of S-box makes the substitution not flexible. This paper proposes new method for image encryption. We use the key matrix randomization concept to apply on dynamic S-box so that S-box becomes '1 to n' mapping and complexity. First, Chaotic NCA map is applied to generate dynamic S-box which is used for substitution. During substitution phase for each image's value, we apply chaotic Arnold cat map combining chaotic Chen system to shuffle the positions of S-box. After that chaotic Baker map which takes parameter sequence from Gauss map is chosen to perform permutation phase. The experiments show that the secure property of this method gets high efficient from attacks. © 2013 IEEE.
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    Extended Baker map using Scan patterns for image encryption
    (2013-01-01)
    Hung, Pham Anh
    ;
    Sooraksa, Pitikhate
    ;
    Klomkarn, Kitdakorn
    In this paper, an improvement on free-size image encryption scheme using Baker map combining Scan patterns is proposed. The generalized discrete chaotic Baker map uses sequences of parameters generated by chaotic Gauss map to divide image matrix into boxes. Scrambling method is done by using Scan patterns in each boxes of chaotic Baker map. After scrambling method, chaotic 3-D Chen system is selected to do the pixel transformation. Through the experiments, the security of proposed scheme is tested by introducing keys analysis, entropy analysis, statistical analysis, and processing time so that the scheme achieves high encryption efficiency © 2013 IEEE.