An enhanced color visual cryptography scheme based on the binary dragonfly algorithm

Visual cryptography is an encryption technique that decomposes a secret image into multiple shares that are digitally 'overlapped' based on logical operations to recover the original secret image. Each individual share cannot reveal clues about the secret image. Existing visual cryptograph...

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Vydáno v:International journal of computers & applications Ročník 44; číslo 7; s. 623 - 632
Hlavní autoři: Ibrahim, Dyala R., Abdullah, Rosni, Teh, Je Sen
Médium: Journal Article
Jazyk:angličtina
Vydáno: Calgary Taylor & Francis 03.07.2022
Taylor & Francis Ltd
Témata:
Algorithms
Color imagery
Complexity
Cryptography
Dragonfly algorithm
Encryption
Histograms
Image quality
Image reconstruction
optimization algorithm
secret sharing
security
visual cryptography
ISSN:1206-212X, 1925-7074
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Shrnutí:Visual cryptography is an encryption technique that decomposes a secret image into multiple shares that are digitally 'overlapped' based on logical operations to recover the original secret image. Each individual share cannot reveal clues about the secret image. Existing visual cryptography schemes suffer from problems such as pixel expansion, high computational complexity and poor decryption quality. To overcome these problems, we propose a new 2-out-of-2 secret sharing scheme for color images based on the binary dragonfly algorithm. The dragonfly algorithm is used to determine optimal color levels for the encryption process, which leads to reconstructed images with the higher quality upon decryption with minimal effect on the overall computational complexity. The proposed scheme is also non-expansible, whereby the share images are of the same size as the original secret image. This leads to reduced memory requirements as well as improved image quality. We analyze the strength of the proposed scheme based on a standard set of metrics which includes an evaluation of its resistance against cryptanalytic attacks, histogram, correlation, entropy and encryption quality. Results show that the proposed visual cryptography scheme has desired properties such as improved recovered image quality, near-ideal statistical characteristics and fast encryption speed, depicting an improvement over existing schemes.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 14
ISSN:1206-212X
1925-7074
DOI:10.1080/1206212X.2020.1859244