Last time we’ve seen some popular fictional passwords, and how they are used in Exploit.in – a collection of 739,861,478 leaked passwords. I wanted to take another look at some popular numbers and how they are used in passwords.
How many digits of Pi have you memorized? I’ve got 6 digits after the decimal:
3.141592. Not bad, but could be better. Let’s see how far the Exploit.in community takes it:
17,713 password have exactly 7 decimal places of Pi (
1415926). 1,626 have 10 decimal digits. The record is a single password with 37 digits of Pi –
1415926535 8979323846 2643383279 502884179. The last two digits in that password are cunningly reversed (
79 instead of
97), so unfortunately they don’t count.
Here’s a breakdown for the digits of Pi in passwords:
Same as with Pi, I’m only considering digits after the decimal point:
Didn’t make it: Conway’s Constant, Khinchin’s constant, and Glaisher Kinkelin.
One advantage of the Fibonacci sequence is that if you forget your password you can always calculate it. 25,316 unforgettable passwords contain 8 Fibonacci numbers (1 through 21). Only 4 passwords make it all the way to the 15th number, 610:
Physics and Chemistry constants
|Number||Digits||Passwords||Light Speed||Meters/Second||299792458||1988||Light Speed||Miles/Second||186282||298||Light Speed||Kilometers/Second||299792||2561||Light Speed||Miles/Hour||670616629||1||Avogadro||6.02×1023||6021023||259||Avogadro||6.022×1023||60221023||73|
Avogadro passwords that make good use of special characters include
Unsurprisingly, numbers that appear on TV or song lyrics make their appearance in passwords. I couldn’t find too many examples:
|Tommy Tutone||867-5309 / Jenny||8675309 (Exact password)||13894|
|Tommy Tutone||868-5309 / Jenny||8675310 (contain)||28231|
|Queens of the Stone Age||Regular John||16278263789||7|
40,430 passwords are exactly
4815162342. Additional 34,318 password contain
4815162342, and another 1,058 passwords have The Numbers with separators, for example
For a more serious analysis of password trends and common patterns:
- Analyzing the Patterns of Numbers in 10 Million Passwords – By Max Woolf
- How are users choosing their passwords on the internet?
- Why So Many People Make Their Password ‘Dragon’ – By Louise Matsakis, Wired (warning: soft paywall)
- Unmasked: What 10 million passwords reveal about the people who choose them