Ah, okay. Thanks! Maybe I was thinking of hash functions, for which it's not guaranteed that every output has an (n-sized) pre-image? Edit: To clarify, I do no

Ah, okay. Thanks! Maybe I was thinking of hash functions, for which it's not guaranteed that every output has an (n-sized) pre-image? Edit: To clarify, I do now understand that you were proposing: random number X -> output encrypt(X), encrypt(X+1), encrypt(X+2), etc Which I had misinterpreted as: random number X -> output encrypt(X), encrypt(encrypt(X)), encrypt(encrypt(encrypt(X))) etc.