• R.venkateshwarlu
• Dr. R. Jegadeesan

Currently, security is the most effective hand of Internet and network applications. In the current generation, Internet applications and networks are growing very fast, so the importance and value of data exchanged through the Internet or other types of media are increasing. Therefore, the search for the best solution to offer the necessary protection against illegal data attacks along with the provision of these services on time is one of the most interesting topics in communities related to security. Cryptography is one of the main categories of computer security that converts information from its readable form into an illegible form. The two main characteristics that identify and differentiate one encryption algorithm from another are its ability to protect data protected against attacks and its speed and efficiency to make it so important. This document provides a fair comparison between the four most common symmetric key cryptography algorithms: DES, AES, Blowfish and Twofish. Since the main concern here is the performance of the algorithms in different configurations, the presented comparison takes into account the behavior and performance of the algorithm when different data loads are used. The comparison is made based on these parameters: speed, block size and key size. A simulation program is implemented using C programming and Java programming.

Cryptography, DES, AES, Blowfish, Twofish Encryption, Decryption.

"Comparison of DES, AES, Blowfish and Twofish Symmetric Key Cryptography Algorithms ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 4, page no.639-647, April-2019, Available :http://www.jetir.org/papers/JETIRAU06098.pdf

"Comparison of DES, AES, Blowfish and Twofish Symmetric Key Cryptography Algorithms ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 4, page no. pp639-647, April-2019, Available at : http://www.jetir.org/papers/JETIRAU06098.pdf