The term 'make into a cipher' can be summarized as the process of encoding a message using a cipher. A cipher is an algorithm used to encrypt and decrypt a message, making it unreadable to anyone who does not have the key to decode it. The crossword solution for this term is 'ENCODE', which means to convert a message into a secret code. Encoding a message using a cipher is a way to protect the information from being read by unauthorized individuals.