Tag Info

Hot answers tagged


For a fixed key, a block cipher is presumed to behave like a pseudo-random permutation (PRP) over messages. What we are interested in is if the permutation contains a fixed point, i.e. if it is a derangement or not. What we find is that there is about a 63% chance that there is at least one fixed point, and the expected number follows a Poisson ...

Only top voted, non community-wiki answers of a minimum length are eligible