The message was written in 'cipher'. [=the message was coded]
She was nothing more than a 'cipher'.
a 'cipher' that can't be decoded
(..) His notebook. You stole it? I borrowed it for tonight. I thought you could translate some of it... I can't. No one can. It's a cipher. Even with the keyword, it will take months to decode. - And without the keyword? - Perhaps never. - We'll see. (..)2006 The Prestige
(..) God, I miss New York, though. - Why are you here? - The lightning lives here. And not much else. Our work is secret. That a cipher? A rotating transposition that shifts every day of the diary. Simple but time-consuming to translate, even with the five-letter keyword. Which is? (..)2006 The Prestige