A Secured Symmetric Key Encryption Technique using Images as Secret Keys

摘要

Symmetric key cryptography is the most common cryptographic scheme which uses same key at both sender and receiver side. The plus point of symmetric key cryptography is its less computational cost when compared to public-key cryptography. In this study, a new symmetric key cryptography scheme is proposed. Rather than using typical binary secret keys this scheme uses images as secret key. Images are comprised of pixels, this work is going to exploit that property of the image. Every character in the message to be encrypted is converted into its corresponding ASCII values and image is scanned till a match is found. After a match is found the pixel co-ordinates are taken and encrypted and are written to a file. This file is transmitted to the receiver who decrypts the co-ordinates and compare with image to get the message.