A Symmetrical key Cryptography Analysis using Blowfish Algorithm

Abstract

Due to the growth of multimedia applications, the need of information security has been become a necessity in this modern technology. The encryption and decryption is used to securely transmit data in open network. The encryption will hide the information that is not visible to anyone using a key. The different techniques should be used to protect confident image data from unauthorized access. This paper is about encryption and decryption of image using a symmetric key called as 64 bit blowfish is designed in the MATLAB software. This proposed algorithm will increase the security and improve performance by reduces the encryption and decryption time. This algorithm uses a variable key of size 448 byte that provide more reliable and secure than any other algorithm. In this, four S-boxes lookup, multiplication as well as fixed and data dependent rotation will be used.