1.6 KiB
Password-Entropy-Calculator
Built off of tests-always-included/password-strength This Calculates the relative strength of a password using several techniques. Primarily this relies on letter trigraphs, which check each set of 3 characters in a given password. This also calculates the entropy bits based on Claude Shannon's technique on determining the number of bits required to represent a set of characters and multiplying it by the length of the password and there's a check to see if a password is contained in a list of common passwords and as a bonus there's also a "Search Space" or (Total Possible Combinations) Calculator, inspired by GRC's Interactive Brute Force Password “Search Space” Calculator. You can toggle between the normal algorithm and GRC's algorithm.
The normal algorithm is:
Math.pow(number-of-characters, Password-length);
and a symbol character set size of 32.
GRC's algorithm is:
function GRC(Password-length)
{
if(Password-length < 1)
{
return 0 ;
}
if (Password-length == 1)
{
return Math.pow(number-of-characters, Password-length);
}
return Math.pow(number-of-characters, Password-length - 1) + GRC(Password-length - 1);
}
and a symbol character set size of 32.
Format:
