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The Playfair cipher is a digraph substitution cipher. It employs a table where one letter of the alphabet is omitted, and the letters are arranged
The Playfair cipher is a digraph substitution cipher. It employs a table where one letter of the alphabet is omitted, and the letters are arranged in a 5x5 grid.
(a) Using Playfair cipher, encrypt a plaintext "Cryptography is the practice of techniques for secure communication" with a key "PLAYFAIR". Remove the letter "J" from the alphabet.
(19 marks)
(b) Is there any drawback of Playfair cipher? Justify your answer.
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