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91 Comments
- swordedge, on 10/10/2007, -2/+31CAPTCHA is not capable of stopping spam, only slowing it slightly. Porn sites are sending their subscribers yahoo mail CAPTCHA images and getting them decoded by their site visitors. They then use that information to sign up for a yahoo email account to spam people with. Very clever and really hard to stop.
The only good CAPTCHA is the one where you are decoding pages of a book that are being typed in to the computer.
Learn all about CAPTCHA here http://www.grc.com/sn/SN-101.htm - satx, on 10/10/2007, -3/+20Obligatory- the one fool-proof captcha:
http://www.hotcaptcha.com/ - satx, on 10/10/2007, -1/+12I think you mean "subjective," Webster.
Anyway, of course it's not meant to be taken seriously. IT'S A JOKE. - holygram, on 10/10/2007, -1/+12Bad description and bad title. The article isn't about captchas, its about recaptcha.
- str3ama, on 10/10/2007, -1/+12"Each new word that cannot be read correctly by OCR is given to a user in conjunction with another word for which the answer is already known. The user is then asked to read both words. If they solve the one for which the answer is known, the system assumes their answer is correct for the new one. The system then gives the new image to a number of other people to determine, with higher confidence, whether the original answer was correct."
from http://recaptcha.net/learnmore.html
In layman's terms: It takes a word that has been verified, and shows it with a word that it is uncertain about. Then if you get the word it knows is correct it assumes you entered both words correctly. It shows the word it didn't know to several people, and if they all enter the same word for the unidentified word - it assumes that it is correct and uses that word. Pretty nice method actually, it attempts to disguise which word it knows by skewing the word it knows when it shows it to you - so you're uncertain which word it actually knows and thus you have to make an honest attempt to get your message posted - this is really quite clever, and embodies what web 2.0 was supposed to be ideally - crowd sourcing. - penneyisok, on 10/10/2007, -1/+10The one your talking about for reading books is here: http://recaptcha.net
- SSCrow, on 10/10/2007, -1/+10Haha, thats awesome.
But it really should be called.
'Select the nonfat people Captcha.' - Rockmaninoff, on 10/10/2007, -1/+7Really interesting article. Way to kill two birds with one stone...
- relaxeder, on 04/17/2009, -1/+5This is gay, I'm going outside.
- bluedig, on 10/10/2007, -1/+5It talks about a process of digitizing books by sending words that cannot be read by computers to the Web in the form of CAPTCHAs for humans to decipher.
But if a computer can't read such a CAPTCHA, how does the system know the correct answer to the puzzle? Here's how: Each new word that cannot be read correctly by OCR is given to a user in conjunction with another word for which the answer is already known. The user is then asked to read both words. If they solve the one for which the answer is known, the system assumes their answer is correct for the new one. The system then gives the new image to a number of other people to determine, with higher confidence, whether the original answer was correct.
What a clever idea. Twitter already uses this type of CAPTCHA - TenebrousX, on 10/10/2007, -1/+5stupid
pointless
annoying
message - DaffyDuck, on 10/10/2007, -1/+5I think you mean subjective.
- holygram, on 10/10/2007, -2/+6Oh man, you're so cool. One day, maybe I can be cool enough spam the internet.
- jennamalia, on 10/10/2007, -1/+5Headline could benefit by adding "per day" context.
But I'd be most interested in seeing the actual statistics that were used to generate this figure. - Shiner6, on 10/10/2007, -3/+6Correct me if I'm wrong, but aren't you a Digg user?
- manitoba98xp, on 10/10/2007, -2/+5And that's what this article talks about...
- shinynew, on 10/10/2007, -0/+2ok so you start them out with some fake ones and then once you get a couple generations that solve all the ones you throw at them start them off with some real ones.
- GreenAlien, on 10/10/2007, -0/+2I think Steve mentioned it might work if we use video instead, and take loads of stills from the footage. Then there are things you can do toy with the image so its different every time it's shown. I actually think this is an excellent idea that WILL work if implemented properly.
Regardless which CAPCHA technique used, the harder issue to solve is preventing a a system from using humans to do the work for them (Also mentioned in that episode). It's ingenious, but must be SOME way to detect it surely. Maybe by having an algorithm which shuffles the images based on IP address at the client end - could be a job for Flash as it's harder to reverse engineer than Javascript. - PathDaemon, on 10/10/2007, -1/+3It knows one of the two words.
- Emilio8605, on 10/10/2007, -1/+3So there's a 25% chance that you give it the wrong unrecognized word with the one it already knows and it will still put it through?
- lengau, on 10/10/2007, -1/+3listen to the Security Now episodes about CAPTCHA. That doesn't work because there's a limited number of images.
- deadlift, on 10/10/2007, -0/+1The problem with genetic algorithms is that some of them take a while to process - and the captcha expires. For example Myspace's captcha session duration is 60 seconds.
- shinynew, on 10/10/2007, -0/+1yes, but you still have to get at least one correct.
- lengau, on 10/10/2007, -0/+1@colin409 - Doesn't hormel's name for it come from that skit, too?
- loconet, on 10/10/2007, -1/+2You have to enter the unknown text and a second text the computer already knows about. It then assumes your answer is correct if you answered the known text correctly. It then asks other humans the same unknown text to verify your answer and that you are not a complete retard.
- SSCrow, on 10/10/2007, -2/+3Whoops.
Just did the captcha thing 50 times.
Kind of addicting. - inactive, on 10/10/2007, -3/+4It's horrible on Myspace and Digg. Atleast 90% of the time I have to try numerous times just to get it right on both sites because it's ***** hard as hell to make out. I'd rather have spam than get pissed off at trying to leave a comment and then saying ***** it.
- brotherfranciz, on 10/10/2007, -0/+1Well, I'm thankful that I don't need to type in a captcha in order to digg something or post a comment...
- tanto, on 10/10/2007, -0/+1Posting your email address on your website is generally an invitation for spam. Automated programs better known as “bots” will eventually scan your website and parse out your email address from the rest of the source code and use it for purposes other than what you intended.
http://customerdataplus.com/blog/2007/09/16/does-your-website-need-some-captcha/ - brasso, on 10/10/2007, -0/+1That explains it, thank you!
Something else that was interesting is the fact that at least two persons buried me but only one replied with an answer. It isn’t really assumed knowledge. - Shiner6, on 10/10/2007, -0/+1"My group has reverse engineered many of the popular captchas (Myspace, Google's captcha, forum software captcha)"
That leads me to believe you spam more than just MySpace users. And I meant spammers in general. Just because a persons child has not been raped, that does not mean that person does not hate child molestors. Basically since you are scum, people hate you. It's that simple. - mastertop, on 10/10/2007, -1/+2additctive. (indeed)
- DaveClarkOne, on 10/10/2007, -3/+4Spammers as in YOU? We need 20 digit captchas for "special diggers"
- deadlift, on 10/10/2007, -0/+1Shiner6,
Keep thinking that I really care. - shinynew, on 10/10/2007, -0/+1It really really shouldnt be that hard to break CAPTCHAs, Especially if you make it genetic algorithms, Its always very clear if you passed it or not, and most places let you do it as much as you want.
- GreenAlien, on 10/10/2007, -0/+1"And would it freakin' hurt to weed out lowercase L's and 1's and zeroes and O's so we don't have to guess at which is which?"
Those with common sense which implement these systems will do just that. It's such an obvious thing to do.
I'd like to see Digg use an image based system. As Apple says, "Think Different". ;) - str3ama, on 10/10/2007, -4/+5making everyone type in a 6 letter combination that's difficult to read and usually takes 2-3 tries to get right doesn't make very much sense. Instead, how about something more simple - like picture capatcha - click the "image of the dog", or something based on the theme of your site.
- lengau, on 10/10/2007, -1/+2They have two words. The server knows one of them and doesn't know the other. Then, if they get enough people saying that the one word is a specific word, that word becomes validated.
- Grumps, on 10/10/2007, -0/+1Thanks to uneducated those jerk (spammer), we're going through alot of trouble to prevent spam.
- shinynew, on 10/10/2007, -0/+1dugg you down for freakin'
- Shiner6, on 10/10/2007, -3/+4You know about 99.9% of Internet users hate you, right?
- aaliymah112, on 10/10/2007, -0/+1Dude how is that possible? It happens to me as well. But not all the time. Sometimes It gives me a friggin hard time. How many blasted times, must I prove that I'm human??????? AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA!!
- inactive, on 10/10/2007, -1/+2SPAM = Spiced Ham
(the Hormel's canned meat) - Shiner6, on 10/10/2007, -2/+3MySpace != 99.9% of Internet users
- blumenth, on 10/10/2007, -0/+1What about the visually impaired? At least Digg's CAPTCHA has an auditory option.
- rootstyle, on 10/10/2007, -1/+2It must be SO cool to have no morals for money.
But hey, I guess you weren't smart enough to make an honest lucrative living. - colin409, on 10/10/2007, -3/+4CAPTCHAs are becoming more prevalant than SPAM ever was.
- wassim2k, on 10/10/2007, -0/+1...and getting them wrong half the time.
- binilmuthu, on 05/06/2009, -0/+0http://www.socialmarketservices.com/ is our new service site
- binilmuthu, on 01/09/2008, -0/+0We are a worlds largest captcha typers in the world we do upto 500K captchas per day
Our email is services@areyouthere.info
See my profile here -
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