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    The key points from this module are:
    Properties of a One-way Function are:

    It should be easy to compute
    It should be difficult to invert

    An encryption algorithm in any stream cipher is always deterministic.
    A Pseudorandom Function is a deterministic algorithm with two inputs and a single output.
    The two variants of Pseudorandom functions are:

    Pseudorandom Permutation
    Strong Pseudorandom Permutation