Results 11 to 20 of about 3,551 (300)
Perfect contrast visual cryptography scheme
Tongxin xuebao, 2009 A perfect contrast visual cryptography scheme with the best contrast based on both the perfect black visual cryptography scheme（PBVCS） and the non-perfect black visual cryptography scheme（NPBVCS） was proposed.The proposed scheme applied simple Boolean ...
HAN Yan-yan1, HE Wen-cai1, HU Yu-pu1
doaj +3 more sources
Bounds for visual cryptography schemes
Discrete Applied Mathematics, 2010 In this paper, we investigate the best pixel expansion of the various models of visual cryptography schemes. In this regard, we consider visual cryptography schemes introduced by Tzeng and Hu [13]. In such a model, only minimal qualified sets can recover the secret image and that the recovered secret image can be darker or lighter than the background ...
Hossein Hajiabolhassan, Abbas Cheraghi
openaire +3 more sources
Progressive color visual cryptography [PDF]
Journal of Electronic Imaging, 2005 Visual cryptography is a powerful technique that combines the notions of perfect ciphers and secret sharing in cryptography with that of raster graphics. A binary image can be divided into shares that can be stacked together to approximately recover the original image.
Duo Jin +2 more
openaire +2 more sources
Privacy Protection of Digital Images Using Watermarking and QR Code-based Visual Cryptography
Advances in Multimedia, 2023 The increase in information sharing in terms of digital images imposes threats to privacy and personal identity. Digital images can be stolen while in transfer and any kind of alteration can be done very easily. Thus, privacy protection of digital images
Akanksha Arora +2 more
doaj +1 more source
High-Chroma Visual Cryptography Using Interference Color of High-Order Retarder Films [PDF]
, 2015 Visual cryptography can be used as a method of sharing a secret image through several encrypted images. Conventional visual cryptography can display only monochrome images.
Sugawara, Shiori +2 more
core +1 more source
Optimal colored threshold visual cryptography schemes [PDF]
, 2005 Visual cryptography schemes allow the encoding of a secret image into n shares which are distributed to the participants. The shares are such that only qualified subsets of participants can visually recover the secret image.
A. De Santis, S. Cimato, R. De Prisco
core +2 more sources
Visual Cryptography Scheme with Essential Participants
Mathematics, 2020 Visual cryptography scheme (VCS) shares a binary secret image into multiple shadows printed on transparencies. Stacking shadows can visually decode the secret image without computational resources. Specifically, a (k, n) threshold VCS ((k, n)-VCS) shares
Peng Li, Liping Yin, Jianfeng Ma
doaj +1 more source
Hyperchaotic technology-based efficient image encryption algorithm an overview. [PDF]
مجلة جامعة الانبار للعلوم الصرفة, 2023 Multimedia data encryption is so crucial because the multimedia encryption algorithm needs more time and memory, and it is difficult to implement. Because of this, the hyperchaotic image encryption technique is becoming more and more popular, which uses ...
Kawthar Khalaf, Ali Sagheer
doaj +1 more source
New Designs for Friendly Visual Cryptography Scheme [PDF]
, 2015 NSC101-2221-E-032-047Different from conventional cryptography, visual cryptography is an image cryptographic technique proposed by Naor and Shamir. It encodes a secret image into n pieces of noise-like shares.
侯永昌; Z.Y. Quan; H.Y. Liao +1 more
core +1 more source
Personalized Shares in Visual Cryptography
Journal of Imaging, 2018 This article deals with visual cryptography. It consists of hiding a message in two key images (also called shares). The decryption of the message is obtained through human vision by superposition of the shares.
Karim Hammoudi, Mahmoud Melkemi
doaj +1 more source