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Top 10 Worst Captchas
By John | February 16, 2008
Don’t you just love Captchas? CAPTCHA is an acronym for “Completely Automated Public Turing Test.” Completely Automated Public Turing test to tell Computers and Humans Apart.” I just call them PITA (pain in the ass). Here are my top 10 worst Captcha’s ever.
From best to worst:
…
Check out other silly stories
…
Topics: captcha, other, sillystory |
February 17th, 2008 at 1:33 pm
I think this all means that the terrorists have won.
February 28th, 2008 at 7:29 am
[…] Update (2/28):Â A hilarious collection of the 10 worst captchas. […]
February 28th, 2008 at 9:53 am
Is that 6th one (the math problem) real, where is it from?
February 28th, 2008 at 12:47 pm
Number 4 (or is it number 6?) — enter the letters which match the symbols — is most excellent. It’s easy to read, easy to comprehend, and difficult to do programatically, exactly what CAPTCHAs are meant to be.
February 28th, 2008 at 12:51 pm
You’ve bought in to the Captchas Industrial Complex.
February 28th, 2008 at 1:16 pm
Charlie, sure, it’s real. See: http://brad.livejournal.com/2331278.html
February 28th, 2008 at 1:53 pm
Haha, number 6 is hilarious (answer: 7)
Is number 9 in a different (non-greek-alphabet-based)?
February 28th, 2008 at 2:45 pm
The captcha is gonna be obsolete one day. It’s just too annoying.
February 28th, 2008 at 2:49 pm
That is one reason why the captchas on my site http://www.subbmitt.com are easier to read. Some sites you can’t even use them because reading the captchas is just too difficult.
February 28th, 2008 at 2:56 pm
the answer to the math problem is 0. It says so in the equation….
February 28th, 2008 at 3:04 pm
The math “challenge” (hah!) is from therandom.irb.hr/signup.php
page which serves random data for statistical analysis. If you can’t evaluate that trivial expression in a few moments, there’s no way you could usefully make use of the site. In itself, a very reasonable request, but since plenty of programs can perform that evaluation, it fails to achieve the stated aim.
February 28th, 2008 at 3:18 pm
The math-challenge is really not that terrifying. Though I wouldn’t know what to put in there… probably ‘infinity’ or ‘undefined’ since it features a division by zero (Delta*x is in the denominator, thus because x=0, 0 is in the denominator, making the whole equation illegal. Well, at least in traditional mathematics)
If it’s from some math-related site (which I suspect) this ain’t hard at all, but rather a nice example of a good captcha!
February 28th, 2008 at 3:34 pm
it for real:
http://random.irb.hr/signup.php
February 28th, 2008 at 3:50 pm
I would have enjoyed this more if there was a link to the website where each one of these Captchas were found.
February 28th, 2008 at 4:21 pm
i’d like to know where the math one is from too. the answer is 0, by the way…and that isn’t a partial derivative
February 28th, 2008 at 4:46 pm
These days you can spent more time trying to figure out captchas then typing the actual comment.
February 28th, 2008 at 4:50 pm
I hate these stupid inventions. Screw the spammers!
February 28th, 2008 at 5:22 pm
Very well done.
I try to make the best out of blogger word verifications by making up meanings or explaining what the “acronym” really means after I comment.
@Charlie: ((( shaking head )))
February 28th, 2008 at 5:36 pm
Haha i like that last one. i didn’t get it at first
and as for the 4th one who are they trying to keep out with that??
February 28th, 2008 at 5:38 pm
CAPTCHA does not stand for “Completely Automated Public Turing Test.” That would be CAPTT.
CAPTCHA stands for “Completely Automated Public Turing test to tell Computers and Humans Apart.”
You were close, but please check your facts before posting your blogs.
February 28th, 2008 at 5:42 pm
The math challenge is at http://random.irb.hr/signup.php, a service for a stream of truly random bits. It’s appropriate for the audience.
February 28th, 2008 at 5:44 pm
Yes it is, I have seen that one before but it made me smile again. It’s from http://random.irb.hr/signup.php
I think the first one is my favourite though.
February 28th, 2008 at 5:56 pm
Chris,
I have made the correction. However if you are looking for perfection you came to the wrong place…
Thanks
John
February 28th, 2008 at 5:58 pm
FYI…
Some comments were lost because I had to switch servers due to all of the traffic today. Sorry to anyone who lost a comment.
Thanks
John
February 28th, 2008 at 6:04 pm
[…] Top 10 Worst Captchas | John M Willis ESM Blog […]
February 28th, 2008 at 7:32 pm
The capchas at http://www.floort.com are easy to read. Why does making them hard for a human to read make them any tougher? Good examples of programmers running amuck.
February 28th, 2008 at 11:29 pm
[…] and I thought that was a shitty deal, but now I’m actually not sure which one would be worse. Either way, it’s stuff like this that helps me realize that things could always be a whole […]
February 28th, 2008 at 11:55 pm
derivative of sin is cos
cos ((7*0)-Pi/2)
= cos (-Pi/2)
= 0
forget about what appears in front of the cos, it dont matter
have a nice day
February 29th, 2008 at 3:28 am
[…] Top 10 Worst Captchas | John M Willis ESM Blog (tags: captcha) […]
February 29th, 2008 at 6:26 am
# AD Says:
February 28th, 2008 at 3:18 pm
The math-challenge is really not that terrifying. Though I wouldn’t know what to put in there… probably ‘infinity’ or ‘undefined’ since it features a division by zero (Delta*x is in the denominator, thus because x=0, 0 is in the denominator, making the whole equation illegal. Well, at least in traditional mathematics)
If it’s from some math-related site (which I suspect) this ain’t hard at all, but rather a nice example of a good captcha!
Are you being serious? That’s not a fraction at the beginning in the sense you’re using it in, that’s telling you to take the derivative of what’s inside the brackets following it. STOP TALKING LIKE YOU KNOW WHAT YOU’RE TALKING ABOUT!
February 29th, 2008 at 8:02 am
@ doug w — The easier a CAPTCHA is for a human to read, the easier it will be for character recognition software to solver them for the spammers.
The more obfuscated the text of a CAPTCHA is, the less likely it will be for spammers to crack. However, that obviously creates a usability problem.
Long-term spam fighting will not find its solution in character-recognition CAPTCHA tests, though I’m sure there are CAPTCHAs available already which are just as effective (if not more so) than the character-recognition variety.
February 29th, 2008 at 8:17 am
[…] dejo una lista de los 10 peores captchas vistos en Internet. Publicado el Viernes 29 de Febrero En la categoría: […]
February 29th, 2008 at 9:09 am
about number 6…
the derivative with respect to x of sin (7x - pi/2) is
7 * cos (7x - pi/2). Therefore the partial derivative with respect to x in the problem of captcha 6 is
28 * cos (7x - pi/2). When x=0, the derivative also is zero as cos (-pi/2) is zero.
and if x were, say, pi/2, the answer would be -28.
So what appears in front of the cosine does matter. Just not in this case cause x happened to be zero.
P.S. nice collection of bad captchas…
February 29th, 2008 at 9:28 am
[…] zum Beispiel ist wirklich sehr verrückt. Bei John M Willis gibt es die 10 schlechtesten Captchas zu sehen. Und genau das ist der Grund, weshalb ich immer eine […]
February 29th, 2008 at 11:53 am
I agree with the likes of Harry. As much as I understand the need to deter spammers, I think captchas isn’t the best way of doing it. Usability wise, they’re far too troublesome and annoying. I don’t have a better suggestion at the moment, but I do think we’ll eventually come up with a better way to deter spammers. We have to.
February 29th, 2008 at 12:16 pm
See what I had to prove posting to reddit:
http://usingit.wordpress.com/2008/01/19/are-you-human-not-an-easy-question-to-answer-these-days/
I know the pain. Isn’t it ironic today that it is harder for us proving our humnaity than to the machine that it is not? Looking for better solution:)
Keren
February 29th, 2008 at 1:59 pm
Those are some pretty funky ones, the wikipedia one isn’t so bad.
February 29th, 2008 at 3:58 pm
[…] CAPTCHA Here’s a roundup of some frustrating CAPTCHAs Top 10 Worst Captchas | John M Willis ESM Blog Quaker Oatmeal Squares Cereal is an important part of your life. aim: drewandnotu | yahoo: […]
February 29th, 2008 at 4:36 pm
Photoshopped.
March 1st, 2008 at 2:00 am
hey! numero uno! whats ur deal!!!!
March 1st, 2008 at 5:04 am
[…] Top 10 Worst Captchas - Don’t make your Captchas like these ones! […]
March 1st, 2008 at 10:43 am
[…] John M. Willis has ‘em. […]
March 1st, 2008 at 11:29 am
[…] überall und das nur weil ein paar Spammer, es nicht sein lassen können. Jetzt hat ein fleißiger Blogger ein paar besonders nervige […]
March 1st, 2008 at 3:25 pm
[…] Top 10 Worst Captchas | John M Willis ESM Blog […]
March 2nd, 2008 at 3:57 am
[…] Top 10 Worst Captchas: Are you feed up with all “Are you human???” test. Some ask to add two numbers and some ask you to enter the alphabets scribbled on the rusty image, all this make you feel irritated. Right? Author John Willis have collected such top 10 worst captchas, have a look at them. […]
March 2nd, 2008 at 4:46 am
Heh, the only comment that shows he knows how to differentiate here is Jay Kay’s one, he even remembered the chain rule. Kudos Jay Kay; shame on you to Steve, Ad and big c! Nice captchas, i guess i’m not human. (-_-)
March 2nd, 2008 at 10:49 am
[…] Top 10 worst captchas (via BRB) […]
March 2nd, 2008 at 1:44 pm
Meh 28*cos(7*x-pi/2), it’s just calculus
March 2nd, 2008 at 1:51 pm
[…] Top 10 Worst Captchas | John M Willis ESM Blog […]
March 2nd, 2008 at 4:27 pm
I predict that within the next 10 years, advances in artificial intelligence (especially image recognition algorithms) will make it nearly impossible for a website to differentiate between a human user and a web bot.
March 2nd, 2008 at 7:19 pm
[…] referred to as the Slashdot Effect. Last Thursday the meta-blog site called Reddit somehow put my Top 10 Worst Captchas on its top 25 first page. By 9 am I had 7k views on that one blog. By the end of the day I […]
March 3rd, 2008 at 12:55 am
shame on you Nam, nothing i said was wrong in my solution to the math problem. Jay Kay simply stated that evaluating the derivative at some other point might make the value in front of cos matter (so long as the equation does not resolve to some scalar multiple of cos(((2n+1)Pi/2)) where n is an integer). And even after what Jay Kay does say, his last statement is the same as mine. I apologize for skipping steps that i thought to be (and Jay Kay proved to be) pointless in this problem
have a nice day
March 3rd, 2008 at 1:20 am
I looked at the link to the blog with #6 in it, and there, x=2pi. That would at least give an answer…why’d you change it?
March 3rd, 2008 at 1:24 am
I looked again, and there are other differences. So, I’m guessing you just didn’t want to give credit unless you had to, so you changed it just enough. Nice. Similar to a ’sound-alike’ in the entertainment industry, but infinitely less necessary. Just credit your pics instead of going straight to Photoshop. It’s not like anybody’s gonna try and charge you royalties.
March 3rd, 2008 at 4:21 am
[…] ten worst captchas. Thank you Webhypes for the […]
March 3rd, 2008 at 7:34 am
[…] johnmwillis Tags: antispam, captcha, facezie, […]
March 3rd, 2008 at 8:27 am
[…] John Willis’ blog post pretty much sums up how irritating these things are. I can barely read any of them. I like the idea of some sort of skill testing question. One captcha on John’s page displays a math question. The answer is 0 but I have no idea why they made it appear so complex looking. It’s not like a bot is going to give up on a question that is too hard for it. A dead simple math question like 2+10 makes sense to me. [?] Share This […]
March 3rd, 2008 at 3:52 pm
the answer is -4
March 3rd, 2008 at 4:03 pm
great great the math problem one, and yea its real, check the link somewhere above…
omg, that proved i wasnt human, i coudnt make it!
March 4th, 2008 at 1:47 pm
Well, i’m pretty sure a computer could figure out #6 way faster than I could.
March 4th, 2008 at 3:24 pm
[…] Via […]
March 4th, 2008 at 4:44 pm
the answer to the math problem is 0 the zero dosent do any thing its calcus d over dx is derivative of and any # is zero unless it is imaginary straight line at the side depends on proffeser
March 4th, 2008 at 5:14 pm
unless the line means integral. then answer is -4. the d/dx and the integral sign cancel out, simply making x=0. the seven disappears and it becomes 4sin(-pi/2), sin(-pi/2)=-1, 4*-1=-4. if this is real, then it would make more sense for a simple answer because it wouldn’t recognize “pi” as meaning pi. [as in; if the line doesn’t mean integral, then 4sin(7x-pi/2)= 4cos(7x-pi/2)*7= 28cos(7x-pi/2), and i don’t think the program would recognize that, compared to 28cos(7x-Ï€/2) or maybe even 28cosine(7x-Ï€/2)…]
March 4th, 2008 at 7:48 pm
Those are horrific. I hate captchas. People seem hell bent on making them near impossible to complete.
March 4th, 2008 at 11:41 pm
I used to be a homeless rodeo clown but since i started using captcha on my blog comments I am now a world class magician !
March 5th, 2008 at 5:30 am
You should try the one from the steampowered forums here : http://forums.steampowered.com/forums/search.php
It’s almost impossible to read, and you must fill it each time you want to search something.
March 5th, 2008 at 8:15 am
This site is awesome. I’ve never seen some of these, but I’ve had some where I kept typing in the wrong code because I couldn’t tell if a character was a “0″ or an “O” or a “6″ or a “G”.
March 5th, 2008 at 12:19 pm
[…] Mail UK) The Origin of Your Favorite Video Game Friends - (Mental Floss) Top 10 Worst Captchas - (John Willis) Chantal Sebire begs French president for the right to die - (News AU) Sauron’s Kingdom - […]
March 5th, 2008 at 2:39 pm
rprebel, the site has a range of math questions, many of the form above. You just didn’t get that one. A single question would be effective.
March 5th, 2008 at 2:43 pm
If only web developers would realize… but these trends lag far behind
March 5th, 2008 at 10:36 pm
rprebel, it’s a CAPTCHA. If it were always the same question you wouldn’t be “proving” that you were a human.
March 6th, 2008 at 12:07 am
The best CAPTCHA I’ve seen, is what Hotmail uses. (This link may not work: https://hipservice.live.com/hipImageDirect.srf?id=68692&config=Hard8Char) The image is high contrast, but lines of the same stroke width and color as the foreground and background intersect over the CAPTCHA text. The result is an image that is still easy for a human to process but a computer will have a more difficult time at it. Too many CAPTCHAs I find rely on a busy background, but they use the same colored type every time for the CAPTCHA text. The extra colors and patterns in the background only serve to confuse humans, because unlike a computer, we cannot adjust our chromakey. A computer will just say, give me every pixel but black (assuming the text color in question is black of course).
March 6th, 2008 at 1:33 am
[…] Captcha definitivo Publicado el Marzo 6, 2008 por Salva Top 10 Worst Captchas presenta una divertida selección de los peores Captcha que existen, o podrÃan existir. La […]
March 7th, 2008 at 7:04 am
[…] an approval process before you can be allowed to make comments on their blog (I guess the ultimate Captcha) . Com on guys, get off your pompous valley-high and let the rest of the world […]
March 7th, 2008 at 1:33 pm
I have unfortunately realized from reading this article that I am, in fact, a robot.
Dammit.
March 8th, 2008 at 6:30 pm
[…] Top 10 Worst Captchas | John M Willis ESM Blog (tags: security usability Funny captcha) […]
March 9th, 2008 at 4:07 am
It’s nice to see some of these. Now I know I’m not the only one that gets 75% of them wrong.
March 9th, 2008 at 10:12 am
This Captcha wasn’t cretaed against bot but against people
March 10th, 2008 at 1:59 am
[…] Quanto ti iscrivi ad un sito e devi copiare le lettere, a volte sono impossibili, alcuni esempi […]
March 10th, 2008 at 9:52 am
This site is awesome. I’ve never seen some of these, but I’ve had some where I kept typing in the wrong code because I couldn’t tell if a character was a “0″ or an “O†or a “6″ or a “Gâ€.
March 10th, 2008 at 10:48 am
[…] More read more JohnmWills 10 worst Captcha (No Ratings Yet) Loading … | Email This Post | Click to save […]
March 10th, 2008 at 12:45 pm
Hee hee, this made me laugh. Seems even some sites have “machines scanning for machines” these days, and if you are not careful to randomize your actions, you may be penalized for being a machine, that is, at least for mimicking machine-like behavior.
March 10th, 2008 at 1:26 pm
LOL…great post. That’s why I love Google. Their CAPTCHAs(on gmail and orkut) are the easiest to read.
March 10th, 2008 at 11:49 pm
Horrible! Lol.
March 11th, 2008 at 6:14 am
never knew that captchas could get this far,,the math one is crazy!
March 11th, 2008 at 7:15 pm
omg XD horrible… i also hate these emensely
too bad that these are so neccesary, maybe if people just stopped trying to use bots, then we wouldn’t have to resort to stuff like this
and i agree, the math one is just crazy XD absolutely crazy
March 12th, 2008 at 11:46 am
At least captcha can stop many spammers.
March 12th, 2008 at 5:51 pm
Someone should create a program that can fill in CAPTCHAs automatically so that real people don’t have to do this crap.
March 12th, 2008 at 9:35 pm
I love the captcha that actually translates books and has whole words b/c if you can’t understand one single letter you can at least reference it from the words.
March 12th, 2008 at 10:24 pm
Great selection of unreadable bullcrap! I hate these things, and can’t wait for the new solution to come along.
March 13th, 2008 at 8:31 am
Ok, I’ll give you my comments on these:
Wikipedia: A once in a lifetime thing, but it’s bound to happen.
Tight letters: Bad luck… Doesn’t even make it much more difficult for robots. It’s a Google captcha though, so you may just click the handicap button and have them read for you.
Symbols: I actually think that captcha looks really good! It’s not too hard for a human but nearly impossible for a robot that isn’t specialized on that one.
Drawn over letters: Just horrible.
Math: This is probably a protection against some humans as well. I mean, assuming this is a math forum, they don’t want people to come in and ask silly question like how to integrate f(x)=e^(x^2)
Graffiti style: Ewww!
Bad contrast: I can read that one. But if I couldn’t I could just open it in Photoshop and extract the code. And if Photoshop can do it, so can a robot… Fail!
Glyphs: Hmmm? What’s this? Sanskrit?
Grey blur: Just very horrible.
Loading image: Oh, that on will load in time. Be patient.
To finish it up, here’s my own submission:
Pigrape!
March 13th, 2008 at 12:56 pm
[…] John M Willis ESM Blog Publicado 13 Marzo […]
March 13th, 2008 at 1:34 pm
[…] stupid post has received over 170k views in just 30 days. Yikes. I’ll take obviously, however I would […]
March 13th, 2008 at 3:35 pm
[…] Los diez peores Captchas que haz vistowww.johnmwillis.com/other/top-10-worst-captchas/ por turl hace pocos segundos […]
March 13th, 2008 at 3:47 pm
[…] ha hecho hasta gracia ver uno de estos 10 peores captchas de la web. Concretamente el de resolver la fórmula matemática, una derivada, como si todo el mundo supiera […]
March 13th, 2008 at 6:19 pm
[…] VÃa John […]
March 13th, 2008 at 8:44 pm
[…] John M. Willis has a gallery of the 10 worst CAPTCHAs on the internet. […]
March 13th, 2008 at 10:05 pm
Lmao
FAIL
March 13th, 2008 at 11:27 pm
[…] mucho peores que el que acabo de mostrar. Mientras escribo este artÃculo, me encuentro con “Top 10 Worst Captchas“, de John M Willis. A continuación varios ejemplos de los peores captchas, sacados de su […]
March 13th, 2008 at 11:36 pm
Guys, for number 6 (the derivative captcha), the answer is simply 0 (zero).
Explanation:
4 is a constant, so you leave it untouched. Derivative of sine is cosine and derivative of the inside of the sine is simply 7. 4 x 7 is 28.
Therefore, we end up with 28cos(7x - pi/2). Since we want to find derivative at x=0, we have that the derivative will be 28cos(-pi/2). The cosine of -pi/2 is 0 (zero), so the final answer is ZERO.
Great post, by the way. Great examples
March 14th, 2008 at 2:20 am
Hard capthas!!
http://www.juzamdjinn.blogspot.com
March 14th, 2008 at 7:42 am
[…] Visto en Johnm Willis […]
March 14th, 2008 at 9:27 am
Wow, great ones, I agree with #4, the one with the symols and the “translation” is great for the pourpose Captchas are. And answering to #100, ok, the calculation was not too complicated, direct solution, but first, not averyone can solve this, and second, what u get from solving it must be a really good thing!! if it’s not… I’m sure I would never waste time calculating this, and probably I’m not the only one.
March 14th, 2008 at 9:02 pm
Realmente, muchas veces los captchas llegan a ser muy molestosos, pero algunos de èstos son tan indecifrables que quizà s si me topo con uno de ellos, pues preferirìa cambiar de pà gina, y si es muy necesario, pues… igual cambiar de pà gina, porque menos mal existe informaciòn por otros lados…
… saludos!!!
March 14th, 2008 at 10:21 pm
[…] Aquà para ver los otros 9 […]
March 15th, 2008 at 3:06 pm
[…] molestos elementos de la web 2.0, en el blog de John M Willis encontré un post donde muestran el Top 10 de los peores Captchas y yo tomé el que más me gustó y por eso el tÃtulo, me refiero a […]
March 17th, 2008 at 11:57 am
[…] Kijk ook verder in het berichtje over de 10 slechtste captchas. […]
March 20th, 2008 at 8:25 am
ha ha… this is excellent..
Captchas can be the best and worst parts of website site ownership / usibility.
Thanks for sharing.
Si
March 20th, 2008 at 8:53 am
You forgot this one…
http://www.nytimes.com/2007/06/11/technology/11code.html
March 20th, 2008 at 4:22 pm
[…] John points us to a list of the worst CAPTCHAs found on the web. If you find worse, let me know. Here they go: […]
March 20th, 2008 at 10:45 pm
[…] 2.0 workplaces [PICS] - UADDit Instrucciones para cuidar un bebé & makememinimalTop 10 Worst Captchas | John M Willis ESM BlogFunny Shit: Bad Domain Names Free Fandango Movie Ticket101 Five-Minute Fixes to Incrementally […]
March 21st, 2008 at 7:56 am
The best of all is that they will continue to get more difficult!!
March 23rd, 2008 at 1:39 am
[…] 关于Captcha，也就是注册时ç»å¸¸è®©ä½ 辨识的文å—或者图案，我们已ç»ä»‹ç»è¿‡ä¸¤æ¬¡äº†ï¼Œéƒ½æ˜¯å…³äºŽæœºå™¨å¦‚ä½•è¯†ç ´å®ƒä»¬çš„ï¼Œè¿™ç¯‡å’Œè¿™ç¯‡ã€‚ä¹Ÿæ£å› 如æ¤ï¼Œäººä»¬æ‰æŠŠcaptcha设计的越æ¥è¶Šéš¾ä»¥è¾¨è®¤ï¼Œå¤§æœ‰ä¸æŠŠäººé€¼ç–¯ä¸ç½¢ä¼‘的劲头。下é¢æ˜¯John总结的10大最糟captcha，由ç¨å¥½åˆ°å·®è¿™ä¸ªé¡ºåºæŽ’列。（真ä¸å¹¸ï¼Œæˆ‘也碰到过好多） […]
March 24th, 2008 at 7:32 am
[…] invito a que echéis una ojeada al post que publican en Jhon M Willis ESM Blog sobre este […]
March 24th, 2008 at 1:50 pm
[…] Some Captchas are really unreadable, some Captchas are difficult to solve quickly, and people try three or four times to get it done. But don’t forget blind users, using screenreaders : nowadays, websites implement alternatives to written Captchas like audio versions - just take a look at Windows Live (Hotmail). […]
March 25th, 2008 at 5:11 am
[…] M Willis hat in seinem Blogeintrag die 10 schlimmsten Captcha-Ãœberprüfungen gesammelt. Viel Spass […]
March 25th, 2008 at 4:47 pm
[…] ZDNet, you have a captcha worse than Typepad (and that’s saying a lot). No wonder the conversation is leaving the […]
March 26th, 2008 at 4:56 am
[…] Top 10 worst Captchas […]
March 27th, 2008 at 12:09 pm
Well, up to my experience as developer I am limiting my Captcha to 3 or 4 characters and hopefully they are a logical word i.e. “word”, “lord”, “nerd” etc.
I think even 10-20 images stored and linked to some words /without random generation/ are enough to determine human.
Anyway, really nice gallery with captchas
March 27th, 2008 at 4:36 pm
[…] So, if you want to check the most annoying captchas out there, check out John M Willis ESM Blog […]
March 28th, 2008 at 3:03 pm
[…] Eric says in his post Congradulations ZDNet, you have a captcha worse than Typepad (and that’s saying a lot). No wonder the conversation is leaving the […]
March 29th, 2008 at 5:44 pm
[…] Los hay de miedo. Comparte esta entrada. These icons link to social bookmarking sites where readers can share and discover new web pages. […]
March 29th, 2008 at 10:25 pm
[…] Más: Top 10 Worst Captchas Troll […]
March 30th, 2008 at 12:06 pm
eu odeio captchas
Abraços
Thales
http://lista10.org
March 30th, 2008 at 1:00 pm
[…] operaÅ£ii online. Nu în toate cazurile aceste captcha-uri sunt inspirat alese. Câteva mai jos (via), cu observaÅ£ia că cel puÅ£in cea "matematică" trebuie că este la […]
March 30th, 2008 at 6:48 pm
“but since plenty of programs can perform that evaluation, it fails to achieve the stated aim”
I would say the challenge is presented as an image, so it is still a big problem for bots.
March 30th, 2008 at 11:35 pm
[…] difficult to crack than the one I am currently using. In the search I came across a list of the Top 10 Worst Captchas. These are were all a little extreme, but would definitely do the job. I doubt I would get any […]
March 31st, 2008 at 8:47 am
São muito fáceis.
Vocês tem que pensar um pouco mais
April 1st, 2008 at 4:38 am
[…] cuidado com seus CAPTCHAS, um blog fez uma coletânia dos 10 piores CAPTCHAS do […]
April 1st, 2008 at 10:33 am
[…] para acessar alguns serviços da internet confirmando que somos humanos, e não meros spans… essa lista foi bolada com os piores captchas […]
April 1st, 2008 at 3:40 pm
[…] Top 10 Worst Captchas | John M Willis ESM Blog Don’t you just love Captchas? CAPTCHA is an acronym for “Completely Automated Public Turing Test.†Completely Automated Public Turing test to tell Computers and Humans Apart.†I just call them PITA (pain in the ass). Here are my top 10 worst Captc (tags: http://www.johnmwillis.com 2008 mes3 dia1 at_tecp CAPTCHA top10 accessibility) […]
April 1st, 2008 at 7:03 pm
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April 2nd, 2008 at 3:35 am
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April 2nd, 2008 at 1:55 pm
[…] captchap Mittwoch, April 2nd, 2008 @ 18:55 | Allgemein top-10-worst-captchas […]
April 3rd, 2008 at 2:27 am
[…] And Just to make it ammusing, here are the top 10 worst CAPTCHA ever, click here […]
April 3rd, 2008 at 2:37 am
What a great collection
April 5th, 2008 at 6:51 pm
I don’t understand your problem. It is all perfectly straightforward to me. What can’t you understand? I start school next week so please address queries to my dad.
April 7th, 2008 at 2:59 am
[…] sind manche von ihnen so konzipiert, daß sie auch vom Menschen kaum zu lösen sind. Die “Top 10 Worst Captchas” zeigt die […]
April 7th, 2008 at 8:25 pm
Wow, lots of confusion on the simple math problem. It’s been explained before, but I’m bored, and don’t want to do my advanced calculus at the moment, so…
d/dx (4 * sin(7x - pi/2) )
Rewriting…
d/dx (-4 * cos(7x) )
28 * sin(7x) | x = 0
28 * 0 = 0
In any case, the captchas I use go something like this:
What starts with bow and ends with ser?
April 13th, 2008 at 2:58 pm
LOL I just went to the actual site with the math CAPTCHA. Here is what I got:
d/dx [4], where x=PI
Well the derivative of any constant is 0, so obviously the answer to that was 0.
Then I got a different one:
d/dx [3 * sin[PI/2] ], where x=PI
Obviously, there is not an ‘x’ to be found, so I guess the answer is again 0.
In other words, if you see a d/dx [?] problem, and it doesn’t have an ‘x’ to derive, then the answer is always 0. Note that the trick only works for the d/dx problems. I tried a few times more and finally got a decent problem:
d/dx [4 * cos[6 x - PI / 2] ], where x=2*PI
The answer is -1, if I worked it out correctly (chain rule and all).
April 16th, 2008 at 12:53 pm
[…] Muito Legal que eu vi no Blog John Wills. […]
April 16th, 2008 at 2:37 pm
its getting worst and worst whit thous things
April 19th, 2008 at 1:49 am
whahahahaha OMG!!!
April 19th, 2008 at 8:57 am
[…] And Just to make it ammusing, here are the top 10 worst CAPTCHA ever, click here […]
April 22nd, 2008 at 10:50 am
[…] Top 10 de los peores CAPTCHAS Ahora que a los se
April 23rd, 2008 at 11:12 am
great find…
man thats CAPTHSUCKS
April 24th, 2008 at 7:22 am
The maths one is horrifying, I feel like giving up maths when I see these sine, theta etc.
April 27th, 2008 at 4:27 pm
[…] sieci można znaleźć mnóstwo zestawień najgorszych CAPTCHA (np. Top 10 Worst Captchas, brakuje jednak czegoś co pokazywałoby źle wykonane CAPTCHA na polskich stronach. Znalazłem […]
April 28th, 2008 at 2:33 pm
[…] zählen, doch wie gesagt die Zukunft sieht “rosig” aus. Im übrigen findest du hier weitere schlimme […]
April 28th, 2008 at 6:08 pm
it’s just first-year calculus, man… you need the chain rule to take the derivative w/respect to x, then evaluate the deriv. at x=2*Pi
(7)(6)cos(6x) - (4)(7)sin(7x + Pi/2)
for x=2*Pi
42 cos (12*Pi) - 28 sin (14*Pi + Pi/2)
42 (1) - 28 (1)
42 - 28 = 14
finally… a use for calculus in daily life (LOL)
May 1st, 2008 at 2:50 am
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May 1st, 2008 at 4:09 pm
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