[EDITED]for those who thought designing a bot-check is easy (in Off-topic)


AdminJonathan August 24 2005 5:08 PM EDT

We haven't had one in a while, but it used to be a fairly regular occurrence that someone would say, "bot checks are too hard! why don't you do [easily defeated bot check] instead?"

This page lists a bunch of such easily-defeated checks. (story now contains no reminder of the guy's bottom)

Special J August 24 2005 5:25 PM EDT

I was going to bring the up earlier, but I didn't want to start the whole discussion.

Oddly, pay pal's is not very strong.

Adrian Exodus August 24 2005 5:37 PM EDT

non pg link....if you look at one sites idea for botcheck...its its ...that guy doing that thing with his bottom :(

Inferno August 24 2005 5:39 PM EDT

Eww, Gross.

xDanELx August 24 2005 5:58 PM EDT

Why isn't CB bot checks in there? :)

[T]Vestax August 24 2005 5:59 PM EDT

Why tempt fate?

AdminQBVerifex [Serenity In Chaos] August 24 2005 6:46 PM EDT

I was going to ask the same thing, how come the glorious CB bot check isn't listed there?

chernobyl August 25 2005 2:58 AM EDT

That site is about CAPTCHA checks, which CB bot checks aren't.

Adrian Exodus August 25 2005 3:05 AM EDT

completely automated public Turing test to tell computers and humans apart.

so something to let a human pass but stump a computer...that sounds like a botcheck.

xDanELx August 25 2005 3:50 AM EDT

What makes Jonathan's bot check extra difficult is the script and merging of lines. The site is a fascinating read especially that piece on how one guy created a program to defeat a CAPTCHA.

AdminShade August 25 2005 5:14 AM EDT

among the things that make jonathans bot checks so hard for computer scripts is that they can recognize letters and words but have extreme difficulties with the overlapping of them.

AdminShade August 25 2005 5:34 AM EDT

but if you go and analyse the CB bot checks then you can also come up with some weaknesses:

almost constant font (though with this comes a change in size and tilting)
low rotation (though font is tilted often)
no color variation
weak deformation (though overlapping could mean the same)

but also strong points:

change in font sizes and style (sort of)
strong perturbation (caused by overlapping)
overlapping words / sort of deformation
tilting words
large dictionary

Sukotto [lookingglas] August 25 2005 10:49 AM EDT

amongst our weaponry are such diverse elements as:
- fear
- overlapping letters
- a fanatical devotion to vocabulary

bartjan August 25 2005 11:30 AM EDT

A typeface in a different size *is* a different font, so the botcheck uses lots of different fonts...

AdminShade August 25 2005 3:14 PM EDT

that was the explanation i was looking for bartjan :)
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