Efficient image encryption and decryption using discrete wavelet transform and fractional Fourier transform
Prerana Sharma, Devesh Mishra, Ankur Agarwal · 2012
We propose an algorithm that shows improvement in computation timeof existing image encryption-decryption methods. The algorithm also introduces additional one-level of encryption key into the existing methods. Image compression properties of the DWT (Discrete Wavelet Transform) are utilized to bring the improvement. The new algorithms retain MSE between input and decrypted images and the robustness of existing algorithms.