Color Image Encryption and Decryption Based on Double Random Phase Encoding Technique

A new technique of color image encryption based on double random phase encoding technique is proposed. The color image to be encrypted is first separated into three color channels: red (R), green (G) and blue (B). Each of these channels is encrypted using double random phase encoding technique and then three new coding image matrixes are constructed. We choose a large enough absolute symmetric image as host image which also been segregated into tricolor channels to hide the real and imaginary parts of the encoding data and discuss the method how to construct the complete symmetrical host image. In the receipted side simple extracted and decryption operations can be employed to obtain the reconstructed image that is the same as the original image. Computer simulations were done in MATLAB and the result shows that the method is powerful for color image encryption and decryption.