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Colour visual cryptography schemes

Colour visual cryptography schemes

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  • Author(s): F. Liu 1 ; C.K. Wu 1 ; X.J. Lin 2
    • View affiliations
    • Affiliations: 1: The State Key Laboratory of Information Security, Institute of Software, Chinese Academy of Sciences, Beijing, People's Republic of China
      2: Computer Science and Technology, Ocean University of China, Qingdao, People's Republic of China
  • Source: Volume 2, Issue 4, December 2008, p. 151 – 165
    DOI:  10.1049/iet-ifs:20080066 , Print ISSN 1751-8709, Online ISSN 1751-8717
© The Institution of Engineering and Technology
Published

Visual cryptography scheme (VCS) is a kind of secret-sharing scheme which allows the encryption of a secret image into n shares that are distributed to n participants. The beauty of such a scheme is that, the decryption of the secret image requires neither the knowledge of cryptography nor complex computation. Colour visual cryptography becomes an interesting research topic after the formal introduction of visual cryptography by Naor and Shamir in 1995. The authors propose a colour (k, n)-VCS under the visual cryptography model of Naor and Shamir with no pixel expansion, and a colour (k, n)-extended visual cryptography scheme ((k, n)-EVCS) under the visual cryptography model of Naor and Shamir with pixel expansion the same as that of its corresponding black and white (k, n)-EVCS. Furthermore, the authors propose a black and white (k, n)-VCS and a black and white (k, n)-EVCS under the visual cryptography model of Tuyls. Based on the black and white schemes, the authors propose a colour (k, n)-VCS and a colour (k, n)-EVCS under the same visual cryptography model, of which the pixel expansions are the same as that of their corresponding black and white (k, n)-VCS and (k, n)-EVCS, respectively. The authors also give the experimental results of the proposed schemes, and compare the proposed scheme with known schemes in the literature.

Inspec keywords: image colour analysis; cryptography

Other keywords: colour visual cryptography; secret image decryption; secret-sharing scheme; pixel expansion

Subjects: Optical, image and video signal processing; Data security; Cryptography; Computer vision and image processing techniques

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