Without a doubt the original solution by Jamie is awesome. When I implemented it last year I took it a step further. I generated the random string, but also generated a random number of positions to ask in a random order.
Anyone registering would be presented with provide anyone of these random combinations:
Sixth, fourth and ninth Or Fifth and ninth Or First, seventh, third and fourth
160 registrations a day dropped to 8-12 overnight.
I've seen registrations climbing again, 20-30 a day. I've considered randomizing the output of the order with a mix of images of the position names with actual text.
Second, sixth(image), eighth(image), fourth
There will never be a perfect solution. It a fine line between real user usability vs stopping spammers.
Tom
On Nov 7, 2014, at 7:55 AM, Bill Traynor btraynor@gmail.com wrote:
I just wanted to point out that if anyone is a user of dynamic questions with questycaptcha as per Jamie Thinglestad's implementation here: http://thingelstad.com/stopping-mediawiki-spam-with-dynamic-questy-captchas/
You may have noticed that recently, the spammers have figured it out and the new user account logs are filling up.
Well, Jamie has updated his solution: http://thingelstad.com/updated-dynamic-questy-captchas/
I've implemented it and so far so good.
Note that to get it to work, I had to change the => to => in the question and answer strings.
Cheers Bill
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