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"1234" and Birthdays Are the Most Common PINs - Schneier on Security

https://schneier.com/blog/archives/2012/02/1234_and_birthd.html

“Research paper: “A birthday present every eleven wallets? The security of customer-chosen banking PINs,” by Joseph Bonneau, Sören Preibusch, and Ross Anderson: Abstract: We provide the first published estimates of the difficulty of guessing a human-chosen 4-digit PIN. We begin with two large sets of 4-digit...” (the page’s own description)

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Last read: 7 Oct 2026
In our index since: 7 Oct 2026
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