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Re:Ask HN: My bank stores PIN as plain text, should I be wor... by gus_massa on Sunday May 09, 2021 @05:12PM (#27099807)
bcrypt already includes salt [1] to prevent the use of rainbow tables. Adding more things is probably not very useful.

Anyway, a 4 digits pin numbers have only 10000 combinations, that can be bruteforced almost instantly.

(On the other hand, sending it by email is not a good idea.)

[1] https://en.wikipedia.org/wiki/Salt_(cryptography)

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