90 percent of Tor keys can be broken by NSA: what does it mean?

Nope! That’s the thing about crypto, it’s asymmetrical. The difficulty of scrambling data scales linearly with keylengths, while brute-force descrambling scales exponentially. It doesn’t take too many bits in the key to encipher a message such that it could not be broken in a universe where every hydrogen atom was made to labor at the speed of the fastest GPU until the heat-death of the universe.

You’re vulnerable at that point to things like implementation flaws and fundamental breakthroughs in math, but not to brute-force attacks.

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