DEVELOPMENT OF AN IMPROVED PLAYFAIR CRYPTOSYSTEM USING RHOTRIX
ABSTRACT Playfair is one of the best-known traditional ciphers but it is limited to different aspects such as: white space, numbers and other printable characters. The existing technique is based on the use of a 5 × 5 matrix. This algorithm can only allow the text that contains uppercase alphabets only. But many algorithms have been proposed which allow extension of playfair to: 6 × 6 matrix, 8 × 8 ...
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