This hack cuts the bandwidth spammers steal when they try to hit your blog if they are in your antispam table. Easily installed, and the biggest (first) part can/will survive upgrades.
This hack creates a stripped-down version of the update script, which can be triggered using a cronjob so that antispam updates are done automatically at regular intervals.
This hack is a b2evolution implementation of captcha code.
A CAPTCHA test is a program that can generate and grade tests that most humans can pass yet current computer programs can't.