A Meaningful Visually Secure Image Encryption Scheme

The cipher image generated by the traditional encryption scheme is meaningless, which is easy to attract people's attention in the process of image transmission, making the transmission unsafe. In this paper, we propose a meaningful visually secure image encryption scheme based on compressive sensing and integer wavelet transform. The scheme is divided into two phases. In the phases one, the plain image is compressed and encrypted based on compressive sensing by sparse and Random Bernoulli measurement matrix. Then the pixel position of the compressed image is permuted by the sequence generated from 2D-LASM in order to increase the security of the embedding phase. In the phases two, another color image is used as a carrier image, and then the integer wavelet transform is used to obtain the meaningful image. Specifically, the carrier image is firstly divided into coefficient matrix, and then the compressed cipher image is embedded into the coefficient matrix to obtain the visually secure image. The experimental results show that the scheme has good encryption and feasibility.

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