A Hybrid Approach for Visual Cryptography Using Caesar Cipher Algorithm

Abstract

Protection and security of information against attacks is becoming crucial for individual people in today's world. New methods for safeguarding information from illegal intrusions are being developed by researchers at regular intervals. A number of cryptographic techniques have been identified, and much more is still to be uncovered. The purpose of the present paper is to examine a more advanced approach for hiding information known as visual encryption. Visual Cryptography is a unique encryption method that uses pictures to conceal information. Using the right image key, the encrypted image can be decrypted by the human eye. This cryptographic method can encrypt visual information, e.g. pictures and text, in a way that allows the person's visual system to decipher it if no computers are needed. A secret image is transformed into a series of shared images, which seem to be meaningful but noisy or distorted, as part of visual cryptography. The initial secret image can be revealed when the two shared images are merged.

This paper focuses on cryptography of black and white images and colored images using Caesar Cipher technique which is employed widely for entry level cryptographic techniques.