I've changed the security graphic. I now use something called Captcha to generate the picture. It now has more colors and different fonts for the digits.
I've used the website bf2stats.com a few times, as I'm now playing Battlefield 2. In the discussion forums I've seen these cool signatures where people show off their scores. Because EA-Games blocked the access to the statistics from other websites, I decided to have a go at it myself. See the text under Read more for the script and a sample.
I think someone is trying to force his way into my CMS. The method they are using is described here, they are just trying to generate the same random number as my server did. On August 7th I had 3600 login attempts in 6 hours. They also applied for a user-account in the normal way, but because I run the Approve Membership module, I stopped handing out accounts after the first 5. In my articles they had posted some weird comments, that triggered the first investigation.