To encrypt and compress the gray image simultaneously
a novel encryption scheme based on parallel compressive sensing and chaotic theory is proposed
which can form a balance between compression and security performance. Firstly
the wavelet coefficients of plain image are scrambled by Arnold permutation algorithm
and then compressed by the key-controlled partial random block weighing matrix. Finally
the cipher image is obtained after quantization and diffusion. Lorenz chaotic system is introduced to generate the key stream for permutation
construction of measurement matrix and diffusion. Via scrambling the sparse coefficients and constructing the measurement matrix with high reconstruction performance
the compression performance of scheme is enhanced. Moreover
the security and robustness are demonstrated by the security analyses.
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references
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