3 ms·

How would it know if you entered it backwards if it was 1221, for example?

• TacticalCoder 5y ago
  Well the obvious solution if one was to use this scheme (which I'm not saying is good or bad) would be, at PIN creation time, to disable palindrome.
  • chii 5y ago
    which removes a lot of possible pins, thus reducing the actual security of pins.
    • remram 5y ago
      Exactly 1% of 4-digit pins are palindromes so that is very acceptable.