pass the pipe, baby, don't bogart.

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Epileptics beware!

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Ok yea. Killing the eyes.

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I think I'm having a seizure.

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The mall at Christmas time.

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ahhhhh the epilepsy oh god

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"such a fine line between stupid and clever"

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Awesome!

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Sweet merciful crap!

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Y'know, that's actually not a bad idea. Not that specific implementation, of course, it's kinda hard to read, but joke or not, animated captchas aren't a bad idea..

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still easily breakable by either testing all frames and using a standard still-captcha algo (actually, it may help an attacker by allowing them to do all frames and then take the most frequent answer) or finding some method of compositing the frames into a single one and then running traditional algorithms on that.

additionally, if the motion is applied in a consistient/uniform manner and/or the perturbation is not, it either adds no additional security, or, in the case of the latter, actually leaks data about edges.

most people never think about breaking captchas when they create them, which is why it's so easy to crack most of them, including LJs.

0 user@host:~/gaffler3$ wc -l gaffle.c
308 gaffle.c
0 user@host:~/gaffler3$

YHBT,
bantown minister of *

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Animated captchas are a horrible idea. Giving an attacker an excess of samples of a given captcha string is a perfect way to assure 100% accuracy. There are only five or six captchas that have presented any difficulty at all in decoding (still pretty easily breakable, you just have to break out some advanced geometry/trig, always done in <1k lines of code) and none of them have been animated.

Also hello brad! We <3 you, we just despise that bitch Denise Paolucci. Fire her ass and everything will be cool.

Adding to the initial YHBT put forward by our * man,
Poisoned Meme, Bantown Minister of Enforcement.

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pretty much the best captcha ever.

i'd throw in more rainbows.

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the letters.. they keep changing in front of my eyes...

the second one is actually easier to read

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That's awesome. You should integrate the Apple2 screen saver into that.

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or phosphor... or AnalogTV

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It's a schooner.

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A schooner is a sailboat! :P

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you're gonna ruin my easter next, aren't you?

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put some tinfoil on your antenna, that should clear right up.

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haha!

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could that leave machine-readable text if you squish it into a static image taking the average darkness for each pixel?

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Yeah, totally. Which is why I later went on to make moving text. :-)

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Yeah, it's a joke, but now my retinas have officially been incinerated, I can put more thought into the underlying idea.

Thinking about it, animated captchas are nice and flashy but generally impractical. It's not hard to pull a single frame from the above example and analyse it on its own, and if you were to break up the sequence or even the letters themselves between frames you'd end up with horribly blinky text that'd leave epileptics paralysed anyway.

It's even harder to generate a captcha that bots can't automatically present to a human in exchange for free pr0n...

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working fine for me, ie6 :)

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Wow, an actual use for image animation. Even if I had to read the comments to figure out that I should turn image animation on to see what the point was (with my default setting of "animate: never" it looked pretty boring).

I'd put image animation up for a "dumbest web feature" award, if it weren't for the fact that there are _so_ many other dumb web features.

Ewen

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I sure don't have it disabled. It never occurred to me to do so. Why would you do that? All the obnoxious things are flash anyway... (And if a site has too much, I go away. Problem fixed!)

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Doesn't work at all for me. I imagine it's because I have animation turned off to preserve my sanity.

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I love it!


I'm tired of all this "Intelligent Design" bull.

Let's stop it with all the wheelchair ramps, and closed captioning, and idiot-proofing. Maybe if we start implementing some real "survival of the fittest" shit, we can convince the rest of the country that Darwin might be right. Be sure the ALT text reads "hey blind people, you're totally fucked here, and weeeeeee like it!"

(Just kidding about the ramps and captions and the blind people. That was just for... uh... "effect". :)

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Inspired. You would have to explicitly say "this is animated" so those of us with animation off can switch it on again, but for all the partially jokey stuff I'm sure you could use animation to make a more readable CAPTCHA. Just take an existing CAPTCHA that works well, like the Passport one, introduce more noise, then recover readability by making the noise flow past the text.

I'm at a con, I must have con fun instead of hiding in my room with my friend's computer trying to code it up...

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Passport has already been broken by the Bantown forces of darkness.

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The point is that this animated variant would be harder to break (much more noise) and easier to read (animation makes it easy for the brain to separate noise from data).

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So I don't see whatever animation is actually supposed to be here. That's not the point though - at first I thought this was one of those 3-d cross-your-eyes things but try as I might, I couldn't see it. That would make a good captcha.

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You're using IE I bet. It doesn't animate it fast enough.

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The fact that there are constant areas within the otherwise variable picture is it's weakness. By taking four or five captures of this, it'd be easy to have a computer layer them, pick out the areas that agree, and solve the captcha.

Still freaking hilarious, though.

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Actually, making one where the first frame contained random lines, and was set to display for 0.0001s or something, might throw of some automated recognition. Although I don't know if that's a real problem yet?

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When the page first loaded, I had my image animation set to "once" and though that it was a random-dot stereogram. However, no amount of crossing my eyes yielded any useful image. Then I tried again with it animation on and wasn't sure which technique would be more evil. Then I realized you could combine them...

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There are plenty of options better than words inside actual images out there: 1. Convert this javascript implementation of CSS shrunken random-text logos to PHP - http://mardeg.sitesled.com 2. Use CSS borders to construct letters like this - http://www.iross.net/csscaptcha 3. Use radio buttons to allow users to match any cartoon image with the one given - http://www.cannedmonkey.com/wordpress/index.php?p=4#comments

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