DESIGN OF DIGITAL IMAGE ENCRYPTION ALGORITHM BASED ON MIXED CHAOTIC SEQUENCES

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International Journal on Smart Sensing and Intelligent Systems

Professor Subhas Chandra Mukhopadhyay

Exeley Inc. (New York)

Subject: Computational Science & Engineering , Engineering, Electrical & Electronic

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VOLUME 7 , ISSUE 4 (December 2014) > List of articles

DESIGN OF DIGITAL IMAGE ENCRYPTION ALGORITHM BASED ON MIXED CHAOTIC SEQUENCES

Wenqing Chen * / Tao Wang / Bailing Wang

Keywords : chaotic sequence, images, scrambling

Citation Information : International Journal on Smart Sensing and Intelligent Systems. Volume 7, Issue 4, Pages 1,453-1,469, DOI: https://doi.org/10.21307/ijssis-2017-715

License : (CC BY-NC-ND 4.0)

Received Date : 21-May-2014 / Accepted: 01-October-2014 / Published Online: 01-December-2014

ARTICLE

ABSTRACT

Digital image scrambling is to transform a digital image, to make it unrecognizable and
become another chaos images without obvious meaning. If the operator knows the algorithms, he can
reconstruct the original image from the chaos image by using the certain algorithms. Image scrambling
encryption technology that based on Chaos Theory encrypts the image data stream through using the
chaotic signal. It has the advantage like high security, encryption speed, large key space, and good
scrambling effect. This paper studies the "extraordinary Key" and "to be trivial key" that are in the
chaotic sequences that is caused by Logistic map, thus presents a image chaotic encryption algorithm
that is based on hybrid chaotic sequence. Firstly, the algorithm generate hybrid chaotic sequence
through the key; then through generates the corresponding offset matrix and permutation matrix the
discrete mapping; finally, do the implementation of wavelet transform to the image, do the digital image
scrambling encryption in the transform domain. In order to measure the degree of scrambling, we
propose a "scrambling degree" concept. Experiments confirmed that the encryption algorithm has
good scrambling in nature, and achieved good encryption effect. It confirmed the degree of scrambling
encryption can effectively reflect the effect of scrambling encryption of the algorithm.

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