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seen Oct 26 '12 at 15:29

Oct
24
awarded  Student
Oct
24
comment Why is a non fixed-length encryption scheme worse than a fixed-length one?
I am not sure about the part of the length of the corresponding ciphertext: note that in the Definition I gave above the Encryption algorithm $Enc$ is a PPT algorithm, therefore we know that $\forall n$ (security parameter) $\forall m$, $||Enc(m)|| < l(||k||+||m||)$, where $l(x) \in \mathbb{Z}[X]$, so we know that the length (i.e. the number of bits, denoted by $||\cdot||$ ) is polynomially bounded, so I don't think we can say that we know the length of the corresponding ciphertext...
Oct
24
asked Why is a non fixed-length encryption scheme worse than a fixed-length one?