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A CAPTCHA (IPAEng: ˈkæptʃə) is a type of challenge-response test used in computing to ensure that the response is not generated by a computer. The process usually involves one computer (a server) asking a user to complete a simple test which the computer is able to generate and grade. Because other computers are unable to solve the CAPTCHA, any user entering a correct solution is presumed to be human. Thus, it is sometimes described as a reverse Turing test, because it is administered by a machine and targeted to a human, in contrast to the standard Turing test that is typically administered by a human and targeted to a machine. A common type of CAPTCHA requires that the user type the letters or digits of a distorted image that appears on the screen.

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Hi, i am interested to work in your captcha entry project. i have experience in data entry, offline/online, captcha project. i have a team with 10pc and 30 users those who r very speedy for captcha entry. my team have good keyboard skills and can deliver 50k or more par day . if your captchas load fast, then I can deliver you the result. pls email me. shakthi.mahesh@yahoo.com is my id. thanks......................

maehsh 10/11/08 04:27:48
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Wikipedia about CAPTCHA

Modern-captcha.jpg

KCAPTCHA%20with%20crowded%20symbols.gif

A CAPTCHA (IPAEng: ˈkæptʃə) is a type of challenge-response test used in computing to ensure that the response is not generated by a computer. The process usually involves one computer (a server) asking a user to complete a simple test which the computer is able to generate and grade. Because other computers are unable to solve the CAPTCHA, any user entering a correct solution is presumed to be human. Thus, it is sometimes described as a reverse Turing test, because it is administered by a machine and targeted to a human, in contrast to the standard Turing test that is typically administered by a human and targeted to a machine. A common type of CAPTCHA requires that the user type the letters or digits of a distorted image that appears on the screen.

The term "CAPTCHA" was coined in 2000 by Luis von Ahn, Manuel Blum, Nicholas J. Hopper (all of Carnegie Mellon University), and John Langford (then of IBM). It is a contrived acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart." Carnegie Mellon University attempted to trademark the term, but the trademark application was abandoned on 21 April 2008. Currently, CAPTCHA creators recommend use of reCAPTCHA as the official implementation.

Characteristics

A CAPTCHA system is a means of automatically generating new challenges which:

  • Current software is unable to solve accurately.
  • Most humans can solve.
  • Does not rely on the type of CAPTCHA being new to the attacker.

Although a checkbox "check here if you are not a bot" might serve to distinguish between humans and computers, it is not a CAPTCHA because it relies on the fact that an attacker has not spent effort to break that specific form.

Withholding of the algorithm can increase the integrity of a limited set of systems, as in the practice of security through obscurity. The most important factor in deciding whether an algorithm should be made open or restricted is the size of the system. Although an algorithm which survives scrutiny by security experts may be assumed to be more conceptually secure than an unevaluated algorithm, an unevaluated algorithm specific to a very limited set of systems is always of less interest to those engaging in automated abuse. Breaking a CAPTCHA generally requires some effort specific to that particular CAPTCHA implementation, and an abuser may decide that the benefit granted by automated bypass is negated by the effort required to engage in abuse of that system in the first place.

Search results for CAPTCHA

reCAPTCHA: Stop Spam, Read Books

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How to use captcha, understand, use and implement captcha, to protect ...

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Free Secure CAPTCHAs

... CAPTCHA For ... a free, secure and easy to install CAPTCHA implementation. ... PHP CAPTCHA Plugin. MediaWiki CAPTCHA Plugin. WordPress CAPTCHA Plugin ...www.captcha.net/captchas/

CAPTCHA Service - Stop Guestbook Spam, Blog spam, Wiki Spam, Comment ...

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Visual and Audio PHP CAPTCHA Generation Class - Ed Eliot

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Images found for CAPTCHA

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News about CAPTCHA

Kaso ng pananambang sa isang broadcaster ng RMN sa Gen. San, tinututukan na ng PNP

RMNIpinag-utos na ni PNP Chief Avelino Razon sa region 12 ang pagsasagawa ng malalimang imbestigasyon sa kaso ng pananambang sa brodkaster ng Radio Mindanao Network na si Dennis Cuesta. Si...http://www.rmn.ph/national/kaso-ng-pananambang-sa-isang-broa...

Ilang opisyal sa Mindanao, nagbanta ng kaguluhan dahil sa pagpigil ng paglagda sa kasunduan ng ancestral domain

RMNNagbabala si Cotabato City Mayor Muslimin Sema sa muling pagsiklab ng kaguluhan sa Mindanao kasunod ng pagpigil ng Korte Suprema sa paglagda ng kasunduan sa Ancestral Domain. Ayon kay Sema...http://www.rmn.ph/national/ilang-opisyal-sa-mindanao-nagbant...

NBA star player Yao Ming, tuluyan na bang hindi na sasali sa Olympics

RMNKinumpirma ni NBA All-Star Center Yao Ming na ito na ang huling pagsali niya sa Olympics. Ayon kay Yao Ming 19 anyos pa lamang s’ya nang magsimulang sumali sa Olympics...http://www.rmn.ph/sports/nba-star-player-yao-ming-tuluyan-na...

Pagtaas sa presyo ng Pandesal, ipatutupad na ngayong linggo

RMNTuloy na ngayong linggo ang pagtataas sa presyo ng mga tinapay. Ayon kay Federation of Bakers Association of the Philippines Vice- Pres. Lucito Chavez bukod sa paggalaw ng halaga ng...http://www.rmn.ph/national/pagtaas-sa-presyo-ng-pandesal-ipa...

Iba’t-ibang ahensya ng Pamahalaan nakahanda na sa ARMM elections

RMNHandang handa na rin ang Parish Pastoral Council for Responsible Voting o PPCRV sa magaganap na halalan sa ARMM sa Agosto 10. Ayon kay PPCRV Chairperson Henrietta de Villa sumailalim...http://www.rmn.ph/national/ibatibang-ahensya-ng-pamahalaan-n...

News about Captcha

Firefox Plug-In Updated To Fight Clickjacking Attacks

NewsFactor NetworkFor example, Adobe added a simple block of JavaScript to prevent a site being able to frame in their security settings config page," Howard said. "Other fixes could be to ensure there are additional steps, such as a CAPTCHA [distorted image] or ... http://www.newsfactor.com/news/Firefox-Plug-In-Fights-Clickj...

NewsRegister.com launches new website

News RegisterWe're going to do everything possible to improve the CAPTCHA look -- we agree that it's a significant shortcoming to this system. Some things, like spell check on comments, simply are not part of this version of website publishing system software. We ... http://www.newsregister.com/article/20233-newsregister-com-l...

Spammers' bot cracks Microsoft's CAPTCHA

ComputerworldRecommended Securing your network begins at the gateway, also called the perimeter, to keep unauthorized users, viruses and malicious code from entering your systems. Deploying multilayer technologies is your first line of defense. With the mobility ... http://www.computerworld.com/action/article.do?command=viewA...

Researcher Claims to Crack Yahoo's Antiscam Filter

PC WorldA security researcher has claimed that Yahoo 's system for blocking automated access to its systems - the CAPTCHA image-recognition system - has been effectively cracked. Effective Block--Until Now? CAPTCHA (Completely Automated Public Turing test to ... http://www.pcworld.com/article/141545/researcher_claims_to_c...

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TechWorldBrocade deal to help drive data-centre transition Its acquisition of Foundry Networks brings together two technologies that are already heading for a merger, according to analysts. CAPTCHA security - more worthless by the day CAPTCHA used to be an ... http://www.techworld.com/features/index.cfm?page=2&pagtype=a...

Search results for Captcha

Free Secure CAPTCHAs

Get a Free CAPTCHA For Your Site. The reCAPTCHA project at Carnegie Mellon University offers a free, secure and easy to install CAPTCHA implementation. reCAPTCHA also channels the ... http://www.captcha.net/captchas/

CAPTCHA Killer | Automated CAPTCHA Solver, CAPTCHA Bypass

CAPTCHA Killer is 100% focused on increasing accessibility on the Internet. There are over 1 Million Americans that suffer from blindness. CAPTCHA Killer can be used to ... http://www.captchakiller.com/

CAPTCHA: Information from Answers.com

CAPTCHA ( C ompletely A utomated P ublic T uring test to tell C omputers and H umans A part) A category of technologies used to ensure that a human ishttp://www.answers.com/topic/captcha-1

Captcha Mashup

Finally, a captcha you'll like"-- Sally, from Witchita "I met my wife on your captcha!!!"-- Steve, from New York Brought to you by FrozenBear using the HotOrNot APIhttp://www.hotcaptcha.com/

What is CAPTCHA? How can I use it?

What is CAPTCHA? How can I use it? ... What is CAPTCHA? How can I use it? What is Captcha? In a CAPTCHA test (an acronym for "Completely Automated Public Turing test to tell ... http://www.modwest.com/help/kb5-329.html
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Captcha

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CAPTCHA KILLS

CAPTCHA KILLSA stupid little video I made, while I was bored. This is how I feel abut those damn Captcha things.Flash - Video

Drupal Captcha Tutorial

Drupal Captcha TutorialA summary of how to integrate Captchas with Drupal.Windows Media - Video

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The HOT Show

The HOT ShowHot captcha , Hotties in the Hoosegow , The REAL Hot 100-alternative hotness, A look at fake hotness because it's something to keep in mind.quicktime: 18.1 MB w:320px - h:240px

The HOT Show

The HOT ShowHot captcha, Hotties in the Hoosegow, The REAL Hot 100-alternative hotness, A look at fake hotness because it's something to keep in mind.msmedia: 2.8 MB w:480px - h:272px

The HOT Show

The HOT ShowThe HOT Show Mobuzz TV S.L. 4 min 0 sec - Aug 15, 2006 Hot captcha, Hotties in the Hoosegow, The REAL Hot 100-alternative hotness, A look at fake hotness because it apos;s something to keep in mind.flash: 0 MB w:320px - h:180px

ka-blamo.mov

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dewplayer.swfcaptcha/ 18-Jun-2005 01:51 - bluewhite/ 18-Jun-2005 01:51 - dewplayer.swf 09-Jun-2005 17:18 2k blue_check.gif 19-Apr-2005 15:55 1kflash: 0.0 MB w:200px - h:20px

Answers for CAPTCHA

wackyzacky

How do I turn off the CAPTCHA on my page?

wackyzackyIf you have more than 10000 friends, people have to put it in no matter what.
stewie9rulez3000

Why Does Myspace Make Me Solve A Captcha When I Message My Friend?

stewie9rulez3000your friend got sick of all the message spam, so they changed their settings so that their friends have to enter a captcha message your friend and ask them to change their settings and then you wo...
amon

Can anyone tell me how to come up with a captcha for myspace?

amonYou can't create a captcha for your whole profile, but in settings, you can set it that people need to imput a captcha to comment you, commebnt your pictures and add you as a friend. To find those se...
prottroy s

I want to do captcha work home base, give some url?

prottroy s
neocow2

How can a get a job CAPTCHA solving?

neocow2

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