In this paper, we aim to investigate the security of multiple images based on affine hill cipher (AHC), fractional discrete cosine transform (FrDCT) and Arnold transform (AT). Three original [Formula: see text] images are encoded as a single [Formula: see text] image by first converting three [Formula: see text] images into three indexed images by extracting their color maps. These three indexed image are treated as [Formula: see text], [Formula: see text] and [Formula: see text] channel of a single [Formula: see text] image. Each channel is first encrypted using cryptographic encryption scheme AHC in time domain. The partially encoded image is transformed to frequency domain using FrDCT. In frequency domain, the partially encoded image is scrambled with the help of AT. The proposed scheme assures security in time domain, frequency domain as well as in coordinate domain. The original images can be recovered correctly by using proper arrangements of secret keys. The storage and transmission of the encrypted image is easy due to single encrypted image. The robustness of the proposed approach is proved by conducting computer simulations on standard examples.
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 DWT 2 (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 IDWT 2 (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.
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