Question

How would you enforce use of a 6-digit PIN rather than a 4-digit PIN

Answer 1

PIN-Personal Identification number is generally used as part of security. PINs are used to protect some intellectual or important data related to personal like ATM PINS, Mobile PINS etc.

If we are using a 4 digit PIN ie, we are using 4 digits from (0-9) to create the PIN, the total number of 4 digit PINs that can be generated if repetition allowed = 10*10*10*10 =10000

Instead if we are using 6 digit PIN the total number of 6 digit PINs if repetition allowed = 10*10*10*10*10*10 = 1000000

The Main threat for security is the hacking or some malpractices. For an attacker there are 10000 combinations to hack a 4 digit PIN. But if we are using 6 digit PIN for an hacker there are 1000000 combinations he need to try to hack. Therefore security will be higher if we are increasing the number of digits.

Thus 6 digits PIN is much safer than 4 digit PIN.