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TimeLord constructs Python PRNG seeds for chosen runs of heads

github.com 7 min read Editor score 7/10

The demonstration chooses an ordinary Python integer seed after specifying the desired output, producing runs of up to 1,000 heads without modifying the generator. It illustrates how adversarial seed selection can make a striking pseudorandom sequence say little about chance.

What

TimeLord constructs an ordinary Python integer seed that makes CPython's pseudorandom generator produce a chosen run of heads.

How

It constrains MT19937 output bits and solves for a compatible state; the result is reproducible, but the seed was selected after the desired output.

Why it matters

Engineers assessing unlikely random outcomes must account for whether the seed was independently chosen or selected after the fact.

Read on github.com → Lobsters · 4 comments

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