A Secure Visual Cryptography Scheme Using Private Key with Invariant Share Sizes  

作　　者：Rola I. Al-Khalid Randa A. Al-Dallah Aseel M. Al-Anani Raghad M. Barham Salam I. Hajir 

机构地区：[1]Department of Computer Information Systems, King Abdullah II School for Information Technology, The University of Jordan, Amman, Jordan [2]Department of Computer and Networks Engineering, Faculty of Engineering Technology, Al-Balqa’ Applied University, Amman, Jordan

出　　处：《Journal of Software Engineering and Applications》2017年第1期1-10,共10页软件工程与应用（英文）

摘　　要：Visual cryptography (VC) is one of the best techniques used to secure information. It uses the human vision to decrypt the encrypted images without any cryptographic computations. The basic concept of visual cryptography is splitting the secret image into shares such that when the shares are stacked, the secret image is revealed. In this paper we proposed a method that is based on the concept of visual cryptography for color images and without any pixel expansion which requires less space. The proposed method is used to encrypt halftone color images by generating two shares, random and key shares which are the same size as the secret color image. The two shares are generated based on a private key. At the receiving side, the secret color image is revealed by stacking the two shares and exploiting the human vision system. In this paper, we produce an enhanced form of the proposed method by modifying the encryption technique used to generate the random and the key shares. Experimental results have shown that the proposed and the enhanced methods suggest an efficient way to encrypt a secret color image with better level of security, less storage space, less time of computation and with a better value of PSNR.Visual cryptography (VC) is one of the best techniques used to secure information. It uses the human vision to decrypt the encrypted images without any cryptographic computations. The basic concept of visual cryptography is splitting the secret image into shares such that when the shares are stacked, the secret image is revealed. In this paper we proposed a method that is based on the concept of visual cryptography for color images and without any pixel expansion which requires less space. The proposed method is used to encrypt halftone color images by generating two shares, random and key shares which are the same size as the secret color image. The two shares are generated based on a private key. At the receiving side, the secret color image is revealed by stacking the two shares and exploiting the human vision system. In this paper, we produce an enhanced form of the proposed method by modifying the encryption technique used to generate the random and the key shares. Experimental results have shown that the proposed and the enhanced methods suggest an efficient way to encrypt a secret color image with better level of security, less storage space, less time of computation and with a better value of PSNR.

关 键 词：Visual CRYPTOGRAPHY (VC) HALFTONE Color Images Pixel Expansion PSNR PRIVATE Key 

分 类 号：TP39[自动化与计算机技术—计算机应用技术]