Intermediate

These articles are aimed at users who have some understanding of spam and are fairly computer-savvy.

Mitigating the accessibility cost of CAPTCHA

CAPTCHA is the most effective anti-spam technique in use today, because it acts as a preventative. However this effectiveness comes at a heady price – seriously diminishing the accessibility of your website.

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Tackling spam in Textpattern

Textpattern, a CMS that this very site uses, has fairly solid anti-spam built-in, but it can be improved with a little configuration.

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Math CAPTCHA

My Mathematics based CAPTCHA. Highly accessible, difficult for spambots due to human language and random sums.

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