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That eliminates all palindrome numbers as possible pins, which is bad for security.


At 4 digits, with a 10 character alphabet, you are looking at a 1% reduction in pin space. Contrast this with the 90% reduction in pin-space you get by not using a 5th digit.


Because it reduces the number of possible combinations? Good reason to keep moving from 4 digits to at least 6 digits.


Found the person with a palindrome pin


No, only the reverse of my PIN is a palindrome.




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