What was the verb(s) the Romans used when the hide/encrypt a message in another text (and also the antonym "to decipher").? After consulting Döderlein's Hand-book of Latin Synonymes (Celare), it was difficult to fixate on a word.
Latin Vicipaedia (Cryptographia) seems to suggest obscuro ("Cryptographi plerumque mathematicis rationibus ad nuntia obscuranda utuntur") or simply scribo [secretum nuntium] ("Cryptographia est ars scientiaque nuntiorum secretorum scribendorum et interpretandorum")
There surely are classical as well as medieval examples but I could not find any.