A Modified Approach for Symmetric Key Cryptography Based on Blowfish Algorithm
Monika Agrawal1, Pradeep Mishra2
1Monika Agrawal, Pursuing M.Tech, Department Of Computer Science & Engineering, SSCET-Bhilai (C.G), India.
2Pradeep Mishra, Professor, Department Of Computer Science & Engineering, SSCET- Bhilai (C.G), India.
Manuscript received on July 17, 2012. | Revised Manuscript received on August 25, 2012. | Manuscript published on August 30, 2012. | PP: 79-83 | Volume-1 Issue-6, August 2012.  | Retrieval Number: F0610071612/2012©BEIESP

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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: The principal goal of designing any encryption algorithm is to hide the original message and send the non readable text message to the receiver so that secret message communication can take place over the web. The strength of an encryption algorithm depends on the difficulty of cracking the original message. A number of symmetric key encryption algorithms like DES, TRIPLE DES, AES, BLOWFISH has been developed to provide greater security affects one over the other. Although the existing algorithms have their own merits and demerits but this paper presents a new approach for data encryption based on Blowfish algorithm. The blowfish algorithm is safe against unauthorized attack and runs faster than the popular existing algorithms. With this new approach we are implementing a technique to enhance the security level of blowfish algorithm and to further reduce the time for encryption and decryption. 
Keywords: Symmetric Encryption, Asymmetric Encryption, Cryptography, Cipher text, Plain text, Decryption.