Comments on: CAPTCHAs without images, part 2

By: Ashant

Ashant — Sun, 13 Apr 2008 10:37:19 +0000

Did anyone mention that the brain teasers actually have a fun-factor to them. Certainly more fun to do one of these than figuring out twisted, bent, twirled, chiseled CAPTCHA character strings.

By: vanfruniken

vanfruniken — Sun, 02 Mar 2008 15:56:47 +0000

One way to achieve this is to use a second domain name for the same blog and adjust the absolute links to fool Google. Hopefully Google will not resolve the IP address. If so, some more clever DNS record manipulation may do the trick (2 IP addresses as well).
Come to think of it, since Google is perfectly able to distinguish between user sites that are subdirectories of the same domain, you could just create two subsites in the same domain, where one gets the google rating and the other one, to which the one with the google rating soft-redirects also contains the more sensitive info. Unfortunately this will not keep hostile humans out:)

Oh, and one important detail: the mirror site that gets the highest ranking should omit the most sensitive information.

By: vanfruniken

vanfruniken — Sun, 02 Mar 2008 15:45:52 +0000

You can tank your blog’s Google ranking by having another one (a mirror), almost identical one, with javascripted absolute links to this blog and hard absolute back links.
Google will eventually find out that both subsites are identical, and it is to be hoped that it will eliminate the correct one from its results.

By: Kim

Kim — Fri, 03 Aug 2007 03:27:04 +0000

I like Trios’s question, it took me a while to find out what is blue. Brain twisting and spam fighting as well. Like Tim mentioned earlier, since your blog has a Google page rank of 5, obviously will attract more spammer than usual. May be there is a way to turn off the ranking indicator…perhaps someone can shine some light here.

By: Trois

Trois — Wed, 17 Jan 2007 20:26:24 +0000

I would Andrea's approach is good:

Which one doesn't belong here: 1) Hand 2) Eye 3) Shoe 4) Hair

3 - as it is no body part - so, you go to matching characteristics of objects (as in IQ tests), instead of asking for a char. of an object ("A lion is a ... (cat)").

What about reversing questions:

What do men like the least - 1) Coffee 2) Women 3) Dishes

Or asking (parts) of a saying (with related incorrect answers):

The best invention since: 1) Wheel 2) Sliced bread 3) Plane

Or combinations:

What is blue: 1) Grass, meat 2) Ocean, mood 3) Men, women

And about your initial system being cracked: what about the spammer reading this blog, entering some posts to learn from it? Good training exercise - in case your system becomes more widely adopted....

But good programming! Thanks for providing it to us with comments.