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# Password-Entropy-Calculator
Built off of <a href="https://github.com/tests-always-included/password-strength" target="_blank">tests-always-included/password-strength</a>
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 <a href="https://www.grc.com/haystack.htm" target="_blank">GRC's Interactive Brute Force Password “Search Space” Calculator.</a>
You can toggle between the normal algorithm and GRC's algorithm. Took me forever to figure out how GRC was calculating their "Search Space Size" but happy to have figured it out. <a href="javascript:(function() {var targetUrl = 'https://bookmarkletserver.000webhostapp.com/github/PasswordEntropyCalculator.html';new Promise ((setQuery) => {var input = window.prompt('ENTER YOUR QUERY:'); if (input) setQuery(input);}).then ((query) => window.open(targetUrl + query));})();">Live Demo</a>
Built off of <a href="https://github.com/tests-always-included/password-strength">tests-always-included/password-strength</a>
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 <a href="https://www.grc.com/haystack.htm">GRC's Interactive Brute Force Password “Search Space” Calculator.</a>
You can toggle between the normal algorithm and GRC's algorithm. Took me forever to figure out how GRC was calculating their "Search Space Size" but happy to have figured it out. <a href="https://bookmarkletserver.000webhostapp.com/github/PasswordEntropyCalculator.html">Live Demo</a>
* The normal algorithm is:
```javascript