| http://www.w3.org/ns/prov#value | - If Bob is able to choose E, there is a risk that he choose it using a deterministic PRNG with some compact seed, allowing him to store only (F, seed) and from that reconstruct F, F', E. I conclude that the scheme can reach its goal only if Bob receives E, and there is no computationally efficient way to reconstruct E from D.
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