Abstract: Visual cryptography is a cryptographic secret sharing scheme which allows secret visual data to be encrypted in such a way that only after decryption process we can get original secret information without the aid of computers. There are various measures on which performance of visual cryptography scheme depends, such as pixel expansion, contrast, security, accuracy, computational complexity, share generated is meaningful or meaningless, type of secret images and number of secret images encrypted by the scheme. This paper is on study and performance analysis of the visual cryptography schemes on the basis of pixel expansion, image format and type of shares generated. This paper describes the novel idea of hierarchical visual cryptography on basis of VC. The key concept behind hierarchical visual cryptography is to encrypt the secret information in number of levels. As the number of levels in hierarchical visual cryptography increases, the secrecy of data tends to increase. The keyshare generated out of Hierarchical visual cryptography is found to be random giving no information and the original secret size is retained in the shares at all levels.
Keywords: VC, Hierarchical VC, secrecy, shares, Expansionless.
Title: Hierarchical Visual Cryptography Applications: A Review
Author: Ms. Pratima Mahamuni, Dr. A.S. Hiwale
International Journal of Electrical and Electronics Research
ISSN 2348-6988 (online)
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