Question: a) Encrypt the following text by using the playfair Cipher ( pay no attention to space between the words ): STUNEX WORM to encrypt this

a) Encrypt the following text by using the playfair Cipher (

a) Encrypt the following text by using the playfair Cipher ( pay no attention to space between the words ): STUNEX WORM to encrypt this message (Key: keyword) [8] b) Pretty Good Privacy (PGP) is a data encryption and decryption computer program that provides cryptographic privacy and authentication for data communication. Explain how PGP carries out authentication operation. [8]

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