期刊名称：International Journal of Computer Technology and Applications
电子版ISSN：2229-6093
出版年度：2013
卷号：4
期号：4
页码：636-640
出版社：Technopark Publications
摘要：This paper describes techniques about secret communication between two people. We have used both cryptography and steganography to implement this. Firstly, we need to encrypt the message using new cipher algorithm called as fourteen square substitution cipher algorithm. Inside this algorithm, first 8 tables are used in upper case or smaller case or combination of both and remaining 6 tables are special symbols or digits. At the time of converting simple text into cipher text, it converts that cipher text into bytes and divide it by 2 and the values which come is called as index variable. Depending upon the index variable value, insert that cipher text in the career image at 6th and 7th bit location or 7th and 8th bit location. Change those bits depending upon index variable x. Index variable x should have value 0 or 1. The index variable value will be changed from 0 to 1 or 1 to 0 after each embedding. The first value of the index variable depends upon the length of the cipher text. After completion of embedding, the resultant image should be sent to the receiver and receiver should retrieve the cipher text from the said locations and then decrypt by using the fourteen square cipher algorithms to get the secret message. The embedding locations are not same in all pixels, so it is a stronger approach. We have implemented this algorithm using c#.net programming language. The twelve square substitution algorithm covered alphabets as well as special character but alphabet 'q is missing' over here. Fourteen square substitution algorithms is used to overcome this drawback. In this algorithm, both upper case and lower case alphabets are used. It will provide more payload too
