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Diffie and Hellman (IEEE Trans. Inf. Theory 22(6):644–654, 1976) wrote the paper in which the concept of a trapdoor one-way function was first proposed. The Diffie–Hellman public-key cryptosystem is an algorithm that converts input data to an unrecognizable encryption, and converts the unrecognizable data back into its original decryption form. The security of the Diffie–Hellman public-key cryptosystem...
In this paper, some novel watermarking approaches which are based on the vector quantization and provide ownership protections in gray-level images are proposed. The proposed approaches combine images, watermarks, and codebooks together. Then, key streams are generated to claim ownerships and guarantee the integrity of images. Non-embedded approaches by generating claimed key streams have the benefit...
Watermarking techniques are primarily used to hide information and for copyright protection. In this paper, we propose a digital watermarking scheme, which is based on visual cryptography and image processing techniques. One advantage of visual cryptography is its capability to exploit the human eyes to decrypt secret images without requiring any computation. The property of visual sharing scheme...
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