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Most to least common 4-digit PINs
(www.grc.com)
or why it is not a good idea to use your birthday as your pin
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this post was submitted on 26 May 2024
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When will we finally move past 4 digit codes for anything important?
Pin codes are great for quick access if you have a lockout mechanism after 3 failed attempts and it is impossible for an attacker to get the hashed code. It is only secure if you pick a pin that cannot be guessed in 3 attempts like your birthdate but that applies to any password.
Thats why they are used for credit cards, SIM cards or Bitlocker drive encryption. The hashed code never leaves the secure hardware so you cannot circumvent the lockout.
Even a 16digit numeric code, which I guess is the upper limit of what you can remember and quickly input, would take just a couple of days to brute force if the attacker does get hold of the hash.