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I guess I misread that post but the more I think about it, the better the idea seems to me. You could have 7 images, generated in random order and that followed by the statement that says: "Click on the image of the boat" and allow the selection. If it is correct, perhaps challenge them with a second randomly generated set of images with a second statement.
If the answer is incorrect, generate a new set of images and a new statement: "Click on the image of the Cat". Correct selections are verified at the server with a few seconds delay to avoid a brute force attack.

I also thought the discussion about image sizes and characteristics to be interesting as well. With some randomness in colors, images, sizes and resolutions, you could probably have a small number of images that could be manipulated into a large number or variants making an automated method of guessing correctly difficult to accomplish.

Interesting discussion.

Pete


Nathan Andelin wrote:
From: Pete Helgren
Couldn't you generate random placement and valid responses each
time and store them on the server? So, boat may be in the first position
the first time and then in the 4th position the second time, etc.

Well, the example that Guillermo posted had just 1 image displayed. And the challenge was to select the appropriate description from 7 radio group options; only one of which would be correct.

But I think you hit upon a key to a strong captcha. The number of options should be large. And the challenge for the client should be random.

It's a lot of work to catalog a large number of images of familiar people, places, and things; along with appropriate descriptions.

But the random idea seems like a good lead. I've been looking at the CEERAN0 api, and calling it from RPG to come up with a procedure for generating random numbers within a parameter range - like give me a random number between 5 and 8, for example. Or, give me a number between 1 and 100. I think I'll add something like that to my toolkit because it seems like something that could be useful for captcha and other things.

Nathan.



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