Reversing sha256ed MACs

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I was watching Dave Borghuis ' fine talk: How I made the municipality pay a 600.000 euro fine for invading your privacy . But before I start with the topic of this post, let me say that Dave is more than a "Privacy activist / worried & critical citizen", he is in fact the shining light in the Dutch "hacker"-scene, a true role-model. He takes responsibility, protects privacy and approaches not only…

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