Plaintext Ciphertext In the early years of the Internet, arotation cipher with key=13 (called ROT13) was often used forpuzzle answers, punch lines, spoilers, or potentially inappropriateor offensiv In the early years of the Internet, a rotation cipher with \( k e y=13 \) (called ROT13) was often used for puzzle answers, punch lines, spoilers, or potentially inappropriate or offensive text. 4. Sh 1 answer