Why guessing a 256-bit key is infeasible
3Blue1Brown · Explainer · 5 min · 2017 · YouTube title: How secure is 256 bit security?
Why it's here
HN uses it as the go-to illustration of just how large 2^256 is.
What it covers
3Blue1Brown illustrates how enormous the 256-bit search space is, showing how infeasible it is to find a hash or key by guessing and checking.