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The internet today is being used by millions of users for a large variety of commercial and non commercial purposes. It is controlled by different entities. It is mainly used as an efficient means for communication, entertainment and education. With the rapid growth of internet, there is a need for protecting confidential data. The Internet was however originally designed for research and educational purpose, not for commercial applications. So internet was not designed with security in mind. As the internet grows the existing security framework was not adequate for modern day applications. Cryptography plays a vital role in providing security. Lot of research is going on block cipher algorithms.
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