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@OddDev @ryanc Because it has an extremely constrained password space.

Assuming the exact scheme in the example: "N+m=#", where all numbers are <100, and the computation is valid... The size of the password space is 100(100+1)/2 = 5050. That's absolutely negligible (even a four digit numeric pin is better).

"But someone's password scheme is not known" you say? It's all about scale. If a scheme is popular, you add it to your cracking database, and you'll be sure to crack several passwords!