Cryptanalysis is the process of deciphering codes, ciphers, or other encrypted messages. Antonyms for the word cryptanalyzes could be encrypt, encode, conceal, or protect. The opposite of cryptanalysis is encryption, which involves obscuring information to make it unreadable without a key or password. Encoding involves transforming information into another form and concealing it, while protection refers to taking measures to safeguard sensitive information from unauthorized individuals. While cryptanalysis is used to crack codes or decipher messages, encrypting and encoding are methods of securing information and protecting it from prying eyes.