Journal ArticleDOI
Securing information display by use of visual cryptography.
TLDR
A set of encryption codes is developed to maintain the designed viewing zone and a display is demonstrated that provides a limited viewing zone that ensures the security of visual information.Abstract:
We propose a secure display technique based on visual cryptography. The proposed technique ensures the security of visual information. The display employs a decoding mask based on visual cryptography. Without the decoding mask, the displayed information cannot be viewed. The viewing zone is limited by the decoding mask so that only one person can view the information. We have developed a set of encryption codes to maintain the designed viewing zone and have demonstrated a display that provides a limited viewing zone.read more
Citations
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Journal ArticleDOI
Colored visual cryptography scheme based on additive color mixing
Ching-Nung Yang,Tse-Shih Chen +1 more
TL;DR: This work studies the additive color mixing in a probabilistic way and proposes a new CVCS whose pixel expansion is fixed and improves on the previous CVCSs, at the price of reducing the contrast quality to certain level.
Journal ArticleDOI
Extended visual secret sharing schemes: improving the shadow image quality
Ching-Nung Yang,Tse-Shih Chen +1 more
TL;DR: This paper presents a new EVSS scheme by using gray and white subpixels to represent the secret pixel, which has the capability of visually revealing the secret image by stacking shadow images without the help of hardware and complex computation.
Journal ArticleDOI
A general multi-secret visual cryptography scheme
Ching-Nung Yang,Ting-Hao Chung +1 more
TL;DR: This paper considers the case when the secret image is more than one, and this is a so-called multi-secret VCS (MVCS), and gives the formal security and contrast conditions of ( k , n )-MV CS.
Journal ArticleDOI
MTVSS: (M)isalignment (T)olerant (V)isual (S)ecret (S)haring on resolving alignment difficulty
TL;DR: This paper designs a misalignment tolerant VSS (MTVSS) scheme based on the trade-off between the usage of big and small blocks to address this misal alignment problem in VSS scheme.
Journal ArticleDOI
Embed additional private information into two-dimensional bar codes by the visual secret sharing scheme
TL;DR: The PDF417 symbol is divided into two modified 2D bar codes by using the (2, 2, h, l, m) Visual Secret Sharing (VSS) technique to provide the public and private information.
References
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Journal ArticleDOI
How to share a secret
TL;DR: This technique enables the construction of robust key management schemes for cryptographic systems that can function securely and reliably even when misfortunes destroy half the pieces and security breaches expose all but one of the remaining pieces.
Journal ArticleDOI
Optical image encryption based on input plane and Fourier plane random encoding.
Philippe Réfrégier,Bahram Javidi +1 more
TL;DR: A new optical encoding method of images for security applications is proposed and it is shown that the encoding converts the input signal to stationary white noise and that the reconstruction method is robust.
Journal ArticleDOI
Securing information by use of digital holography.
Bahram Javidi,Takanori Nomura +1 more
TL;DR: An information security method that uses a digital holographic technique that provides secure storage and data transmission and can be electrically decrypted by use of the digital hologram of the key.
Journal ArticleDOI
Optical pattern recognition for validation and security verification
Bahram Javidi,Joseph L. Horner +1 more
TL;DR: Computer simulation results and tests of the proposed system are provided to verify that both the phase mask and the primary pattern are separately readable and identifiable in an optical processor or correlator.
Journal ArticleDOI
Random phase encoding for optical security
TL;DR: A new optical encoding method for security applications that uses two phase‐only functions at both the input and frequency planes of the optical processor leading to maximum optical efficiency.