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Suppose that there exists a variant of Playfair cipher which supports both alphabets (a,b,...,z) and numbers (0,1,2,...,9) for encryption and decryption. Design the key matrix
Suppose that there exists a variant of Playfair cipher which supports both alphabets (a,b,...,z) and numbers (0,1,2,...,9) for encryption and decryption. Design the key matrix and encrypt the message "happy new year 2021" using the key "HNY2021". Assume the same rules of encryption and decryption as that of normal Playfair cipher.
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