Abstract-In this paper we have proposed a method for an RGB image encryption supported by lifting scheme based lossless compression. Firstly we have compressed the input color image using a 2-D integer wavelet transform. Then we have applied lossless predictive coding to achieve additional compression. The compressed image is encrypted by using Secure Advanced Hill Cipher (SAHC) involving a pair of involutory matrices, a function called Mix() and an operation called XOR. Decryption followed by reconstruction shows that there is no difference between the output image and the input image. The proposed method can be used for efficient and secure transmission of image data.
Abstract-In this investigation, we have generalized and modified the Playfair cipher into a block cipher. Here, we have introduced substitution, interweaving and iteration. The cryptanalysis and the avalanche effect carried out in this analysis markedly indicate that the cipher is a strong one, and it cannot be broken by any cryptanalytic attack.Index Terms-interweaving, inverse interweaving, substitution matrix.
In this research, we have developed a block cipher by taking a large key matrix of size nxn and a plaintext matrix containing n rows and two columns. In this, the plaintext column vectors, operated by the key matrix are thoroughly interlaced at each stage of the iteration. As a typical example, we have taken the key in the form an 8×8 matrix and the plaintext in the form of an 8×2 matrix. Here the key is of the size 384 binary bits and the plaintext is of size 112 binary bits. The cryptanalysis carried out in this research clearly indicates that the cipher cannot be broken by any cryptanalytic attack
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