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a) Decrypt the cipher text SUETCPSKHD using Affine cipher with pair of key (15,20) b) Encrypt the following plain text using Hill cipher. Plain text:

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a) Decrypt the cipher text "SUETCPSKHD" using Affine cipher with pair of key (15,20) b) Encrypt the following plain text using Hill cipher. Plain text: university day 13 31 L25 key = 3

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