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anteloper | 7 months ago

Why do we like entropy in auth factors?

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order

noleary|7 months ago

Imagine two different password strength standards:

1. Just a 4 digit numeric PIN like `1981`

2. A 20 character upper/lower/numeric/special-character password like `qmd1tkf7mwa.PQB0qrz$`

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The PIN has lower entropy and is therefore a lot easier to brute force.

I haven't calculated this stuff myself -- I just used Wolfram Alpha -- but it looks like the PIN would take <1 second to brute force, while the 20 character password would take 7.6 * 10^25 years. [1] [2]

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[1] https://www.wolframalpha.com/input?i=password+strength+qmd1t...

[2] https://www.wolframalpha.com/input?i=password+strength+1981