Analysis of modified Blowfish algorithm in different cases with various parameters

Security has always been a great concern whenever there is communication between sender and receiver. To overcome the issues of security breaches many cryptographic algorithms are used like: AES, DES, Triple DES, Blowfish, etc. The objective of this paper is to enhance and evaluate the Blowfish algorithm on the basis of different parameters like Encryption Quality, Correlation Coefficients, Key Sensitivity Test and Size of Output File. The `f' function is modified by mixing the XOR and addition used in the original algorithm. Four cases are created and analyzed. The results of all the tests conducted on these cases lead to a common conclusion that the security of the modified algorithm with different cases makes the original Blowfish algorithm more compact and more secure than the earlier.