This plugin offers four different methods of protectio. The first is a verification code which is always generated dynamically. The second is that each verification code is given a session id which is different from the PHPSESSID value. The third protection is that every session id and verification code gets their own time stamp. The time stamp works on the premise that humans need a few seconds or minutes to post a comment. The last protection involved IP addresses. The visitor’s IP is stored with the verification code and only when the comment contains the original IP it’s then saved and held for moderation.
WordPress Plugin, Plugin, Plugins, CAPTCHA, Comment, Spam, Anti-spam, Antispam