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Currently, most of the existing public-key encryption schemes are based on complex algorithms with heavy computations. In 1994, Naor and Shamir proposed a simple cryptography method for digital images called visual cryptography. Existing visual cryptography primitives can be considered as a special kind of secret-key cryptography that does not require heavy computations for encrypting and decrypting an image. In this paper, the authors propose a new public-key encryption scheme for image based on non-expansion visual cryptography and Boolean operation. The proposed scheme uses only Boolean operations and therefore requires comparatively lower computations.
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