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by SAI_Peregrinus 1644 days ago
Formatting removed some ^ symbols.

It's worth noting that if those Dyson spheres were quantum computers (and we ignored light-speed delays even within single spheres) you'd only need to count up to 2^128, not 2^256 to brute-force a 256-bit key. Still well outside the realm of possibility for anything smaller than a Dyson sphere.