Password Strength

Česky: BezpecnostHesla

This feature shows, how strong the password is:

• +1 point for each character over 6 in length
• +1 point for being mixed case, upper and lower
• +1 point for including both numbers and letters
• +1 point for including punctuation

• less than 3 points → weak password
• 3 - 5 points → good password
• 5 and more points → strong password

<strong>Type ypur password:</strong>
<input type="password" name="password" id="password" onkeyup="checkPassword(this.value, 'strength', new Array('too short', 'weak', 'good', 'strong'))" />
<br />
<b id="strength">not inserted</b>

Don't forget to include JavaScript library into your page (head section):

<script type="text/javascript" src="password.js"></script>

Integer passwordStrength(String password)

Returns password's strength points

• password - password to be checked

void checkPassword(String password, String id, Array messages)

Displays message

• password - password to be checked
• id - id of element for displaying the message
• messages - array of messages with 4 elements - for example 'too short', 'weak', 'good', 'strong'

© 2008 Adam Heinrich

Licensed under GNU General Public License

Library and example page at http://lib.adamh.cz/password-strength