An enhanced approach on vigenere cipher by polyalphabetics
International Journal of Latest Trends in Engineering and Technology · 2016
Cryptography has become an essential tool in transmission of information.Cryptography is the central part of several fields: information security and related issues, particularly, authentication, and access control.Cryptography encompasses a large number of algorithms which are used in building secure applications.Cryptography is the study of Secret (crypto-)-Writing (-graph).It is the science or art of encompassing the principles and methods of transforming an intelligible message into one that is intelligible and then transforming the message back to its original form.As the field of cryptography has advanced; cryptography today is assumed as the study of techniques and applications of securing the integrity and authenticity of transfer of information under difficult circumstances.Today's cryptography is more than encryption and decryption.Authentication is as fundamentally a part of our lives as privacy.We use authentication throughout our everyday lives when we sign our name to some document and for instance and, as we move to world where our decisions and agreement are communicated electronically, we need to have electronic techniques for providing authentication.Cryptography provides mechanisms for such procedures.The play fair cipher was the first digraph Substitution cipher.The scheme was invented in 1854 by Charles Wheatstone, but it was named after Lord Playfair.The technique encrypts pairs if letters instead of single letter as in the simple substitution cipher .The play fair is significally harder to breaks since the frequency analysis used to simple substitution cipher does not work