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The reasoning is wrong: the whole point of the paper is to establish a definition for secure general-purpose KDFs. In definition 7 of the paper, it is defined that a KDF is secure, if it can withstand distinguishing game from an adversary with capability to query the KDF oracle - that's what something linear like SWIFFT cannot provide. As for the quoted ...


This is the mechanism of the rolling system of one of the best known crypto faucet website. I think that the previous answer above is a bit misleading. However, when the math is confusing, a simple test with some code and some pseudo-random generated data should not leave any doubt. Your statement: "..the way I see it, it is 50% less likely to hit the ...

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