The antonym for the word "de-ciphering" is "ciphering" or simply "cipher". While de-ciphering refers to the act of decrypting or decoding a message or text, ciphering is the process of encoding or encrypting it. In ciphering, a message is transformed into a secret code, making it difficult for unauthorized persons to read or understand it. It is often used for secure communication, such as in military or diplomatic settings. Other antonyms for de-ciphering include understanding, comprehending, and grasping, all of which involve the act of gaining knowledge and clarity about a subject or message.