STRENGTH OF PASSWORD

First, let us take a 4-digit PIN. Let us also assume that a man is attempting to steal it. To get the first digit right, he has to try all the 10 digits (0--9) and 'one' will be correct. So the chance of getting correct first digit, is 1/10. The ' Multiplication rule in probability' says that the chance of getting all the four digits right is 1/10*1/10*1/10*1/10 = 1/10000. It means, if he makes 10000 tires, at one instant he will get the correct PIN. But the bank allows only 3 tries and limited time. So the PIN is safe as long as you keep it safe.

Now our financial transactions depends on the password. Let us see, how to strengthen the password.

Let us consider a 7 character password which can take alphabets and numerals. The total number of characters is 26+10= 36. The chance of getting any one character right is 1/36. As usual, the chance of getting all the seven characters right is 1/36*1/36*1/36*1/36*1/36*1/36 *1/36 = 1/36^7 = 1/ 78364164096. So the chance getting correct password is almost negligible. If you increase the length of the password and add more special characters to the password, its strength increases. It is difficult to break it.

The mathematics behind the PIN and the passwords is strong. So handle them with confidence and care. An example : STRONG password @2018.

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