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Enforcing a strong password might be tricky, but using an automated jQuery process, you can offers users password generation on the registration form.


    <input type="text" name="password" id="password" placeholder="Password" value=""> 
    <a href="#" id="password-generate">Generate</a>

The jQuery:

$('#password-generate').click(function(e) {
    var password = (Math.random()*1e32).toString(36);


Note that I have used a text field for illustrative purposes. When creating a new account and generating a password, it is not necessary to hide it.

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