5. Play fair cipher encryption process is as follows: Before encryption, if the two letters in a pair an the same, a bogus letter 'x is inserted to separat them. After insetting bogus letters, if the number of characters in the plaintext is odd, one extra bogus character is added at the end to make the number of characters even. The cipher uses three rules for encryption: a) If the two letters in a pair are located in the same row of the secret key, the corresponding encrypted character for each letter is the next letter to the right in the same row (with wrapping to the beginning of the row if the plaintext letter is the last character in the row). b) If the two letters in a pair are located in the same column of the secret key, the corresponding encrypted character for each letter is the letter beneath it in the same column (with wrapping to the beginning of the column if the plaintext letter is the last character in the column). c) If the two letters in a pair are not in the same row or column of the secret, the corresponding encrypted character for each letter is a letter that is in its own row but in the same column as the other letter. Encrypt the message 'THE KEY IS HIDDEN UNDER THE DOOR PAD' while ignoring the space and IL G DBA Te M HEC using the Playfair cipher key U R N 1 F. IX V S OK Lz Y W T p]