building a true RNG

[David Wagner]

> DES, being extremely hardware friendly, can be (ab)used to
> make a strong one-way hash.  (E.g., raw input into both key and data maps
> 56+64 -> uniformly distributed 64 bits.)

However, when used in this way, DES is not an especially good hash function.
For instance, it is easy to find collisions, to find pre-images, and so on.

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