Color Image Encryption using Advanced Visual Cryptography

Abstract

Secured and timely transmission of images or graphical data is always an important aspect for an organization. In the encryption process the failure to decode images properly and processing time are directly related with the security of cryptographic model in a network. The use of strong encryption algorithms almost makes it impossible for a hacker to get access to the hidden data inside the image which is being encrypted. Cryptography is an essential component of an organization in order to keep the information safe from various competitors. It helps to ensure the privacy of a user from others. Secured and timely transmission of images are always an important aspect for an organization. In present scenario most of the information is being collected, processed and stored by the computers and further transmitted across the networks, therefore, there is a need to protect the graphical data in order to keep the data confidential. Keeping in view the importance of visual data for secure data transmission this work incorporates the use of image encryption. Current aspects of cryptography as well as the related terms including the visual cryptography approach are discussed in the beginning of this thesis. Literature review for data encryption and visual cryptography has also been discussed. Observations have been presented and problem is formulated. Then a modified image encryption scheme has been presented that meets the objectives such as no pixel expansion and zero contrast loss. After presenting the proposed scheme, its results and comparison with other schemes has been discussed. Finally, the thesis has been concluded and the possible future scope of the proposed scheme has been mentioned.