I need a good Captcha for phpBB

[fatfoo]

Hello,
I have a phpBB forum and lately there has been a lot of spamming bots signing up through the default captcha. So, I need a system to better prevent spam, and to prevent spammer bots from signing up to the forum. I think I need some kind of a better Captcha mod or something like this. Can anyone recommend something? Thanks.
Cheers.

[Yahook]

This one is very good http://captcha.ru/kcaptcha.zip, but I don't know how to insert it into phpbb.

If you search for phpbb mod you will find it, but it's very difficult to recognize this captcha even for people.

[martinsc]

which version of phpbb are you running?
For me, since I upgraded to phpbb 3 (since the early beta stage) I have seen no more spam (i used to get tons of it)

[Yahook]

I've been using phpbb on this site for a long time and now I have vbulletin here. Now I understand that Vbulletin is 100 times better than phpbb.