A Novel Video Encryption and Decryption Scheme based on Discrete Wavelet Transform and Fractional Fourier Transform

We propose three novel algorithms for video encryption and decryption. The algorithms insert one-level of encryption key into the existing methods. Data compression properties of the DWT (Discrete Wavelet Transform) are utilized to make the algorithm faster. The new algorithms retain the robustness of existing image encryption-decryption algorithms. A video is a collection of frames and a frame is similar to an image i.e. it can be segregated into three primary color channels viz. R, G and B. These channels are compressed by these proposed methods by using two times DWT2 (2-D Discrete Wavelet Transform). The compressed frame-channels are encrypted using 2-D FRT (The 2-D fractional Fourier transform) and random phase masks in two successive iterations. The encrypted channels are merged by two times application of IDWT2 (2-D Inverse Discrete Wavelet Transform), generating a color encrypted frame. Decryption process is the reverse of the encryption process. Simulations are performed and the results of these simulations verify the proposals made in the new algorithms.