Security

A New Modified Playfair Algorithm Based on Frequency Analysis

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Executive Summary

Cryptography is an art and science of achieving security by encoding the message to make them non-readable. One of the well known cryptographic techniques is Playfair Cryptography. After the invention of different techniques like Frequency Analysis it is easy to break Playfair. In this paper, the authors proposed some ways for removal of the traditional Playfair drawbacks like, firstly they have used multiple array of structure to store the information about the spaces and the other to store the information about whether an 'X' has appeared in the alphabet matrix. Also, they have supplied a Password mechanism to increase the level of security. Secondly way they have extended the key table from 5 X 5 matrix to 16 X 16 matrix form.

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