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Advances in Multimedia
Volume 2016, Article ID 6714164, 10 pages
Research Article

Image Encryption Performance Evaluation Based on Poker Test

School of Information Engineering, Chang’an University, Middle Section of Nan’er Huan Road, Xi’an 710064, China

Received 26 March 2016; Revised 24 May 2016; Accepted 5 June 2016

Academic Editor: Deepu Rajan

Copyright © 2016 Shanshan Li and Weiyang Sun. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The fast development of image encryption requires performance evaluation metrics. Traditional metrics like entropy do not consider the correlation between local pixel and its neighborhood. These metrics cannot estimate encryption based on image pixel coordinate permutation. A novel effectiveness evaluation metric is proposed in this paper to address the issue. The cipher text image is transformed to bit stream. Then, Poker Test is implemented. The proposed metric considers the neighbor correlations of image by neighborhood selection and clip scan. The randomness of the cipher text image is tested by calculating the chi-square test value. Experiment results verify the efficiency of the proposed metrics.