Chaos in Series to Avoid Serial Attacks on Image: A Secure Image Communication Perspective

摘要

Due to the rapid growth in communication, the transmittal of multimedia contents over the open unsecured channel became vital. Hence the mechanism which provides confidentiality of these contents is needed and that can be achieved with the help of Image Encryption. In this paper, the secured grayscale image encryption was performed using combined chaotic maps namely Logistic Sine-Sine (LS-S) and Logistic Logistic-Sine (LL-S) in transform domain Integer Wavelet Transform (IWT)approach. To validate the proposed algorithm, certain analyses such as Statistical (Correlation, Entropy, Histogram), Error metric (MSE, PSNR), Chosen plain text and cropping were executed. Additionally, the strength of the key was evaluated using key sensitivity and keyspace analyses. The proposed algorithm provides the better near zero correlation and average entropy of 7.9916. The average PSNR of 11.4 dB has been achieved and the keyspace is 10^{68 so as immune to the brute force attack.}