There could also be an option for an administrator's policy, such as I've seen on some blogs: Moderate every new registrants first post (or first several, a number chosen by administrator). Once it's been established their posts are not irrelevant, machine-generated posts, they are no longer moderated.
The problem is that most CAPTCHA's that are readable by humans can be readable by bots. The more difficult you make the CAPTCHA for a bot, the more difficult it will be for the human. There are many "tricks" being used by phpBB to make the CAPTCHA very difficult to crack, but it is always a matter of time before the bot script creators eventually figure out a way to read that particular CAPTCHA, it is then necessary to come up with a new method that will fool the bot scripts until they figure that one out.okiem wrote:1. Make background with characters (but almost not visible). For automates it will be recognizable but human will read only those strong. To making this more complicated you can make two layers of captcha file - background (with very gray characters), and foreground (with black or color)
This is extremely easy for bots to figure out and will only add annoyance for users.okiem wrote:2. Post two captcha on one page and ask to put right cod in first, and FALSE in second. You can put even more captcha with randomizing order. You can also use randomize text for explanation (like: write FALSE, write Mistake, write nut True ...etc)
Logic puzzles are never a good idea because there are humans that will have problems figuring those out.okiem wrote:3. Use fonts which add small characters to some of them. F.e. G___Ta__ H___ Su__Z - this is only 5 characters with two odd.
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