what is captcha

[adrielalfredo34]

Here, the image is placed in which submitted a write to a given frame, or further.

[bonzoi]

A CAPTCHA is a program that can generate and grade tests that humans can pass but current computer programs cannot.

[friv4mini]

Thanks for sharing. I thinks i need it for my site

[earvintrenton]

What is the weirdest or most offensive captcha you have received?

[sandeep22]

Thanks for your suggestion friends, I am still waiting for more suggestions.

[crescendo]

A CAPTCHA is a type of challenge-response test used in computing as an attempt to ensure that the response is generated by a person

[jamsen]

A CAPTCHA is a type of challenge-response test used in computing as an attempt to ensure that the response is generated by a person.

[chugtairizwan]

Hey ! According to me Captcha is something which was created to stop automated computer spam robots from filling out forms, harvesting email addresses and other..

[amybruce]

now i know what is captcha
thank you all

[kevin619]

A CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a challenge-response system test designed to differentiate humans from automated programs. A CAPTCHA differentiates between human and bot by setting some task that is easy for most humans to perform but is more difficult and time-consuming for current bots to complete.

[webmaster3388]

Captcha is one type of a challenging quiz which is used to stop automatic submissions by some black hat softwares or some robots. I think captache is a paid algorithm. So you have to pay for it to place it in your site.

[ashokkumar]

Captcha prevent robot registration.It check visitor is human or not.

[Elanaz]

A Captcha code is a type of challenge or response or test used in computing as an attempt to ensure that the response is generated by a person. The process usually involves a computer asking a user to complete a simple test which the computer is able to grade.

[sydneyrebello2]

To upset the attempts of the spammers the term Captcha is used. An image is put in here which has to be written on a given box before submitting something or proceeding.

[Anne Shirley]

I think CAPTCHA is a type of challenge used in computing to ensure that the response is not generated by the computer or we can say that it is an image that generates some numerical and alphabetical code and some time its called reverse tuning test.

[Beyb827]

The term CAPTCHA (for Completely Automated Public Turing Test To Tell Computers and Humans Apart) was coined in 2000 by Luis von Ahn, Manuel Blum, Nicholas Hopper and John Langford of Carnegie Mellon University. At the time, they developed the first CAPTCHA to be used by Yahoo.

[tnhamanda]

Hello,

For non spam verification CAPTCHA does a good work. But it needs some softwares like GD, imagemagic, freetype to work correctly from server. It also depend upon the OS type you are using for your site.

[fonsecasharon]

yep, catcha is made to stop automated spammers on entering your websites :)

[JasmineRice]

The word of CAPTCHA stands for Completely Automated Public Turing test to tell Computers and Humans Apart. CAPTCHA is a program that protects websites against spammers by generates and grade tests that humans can pass but current computer programs cannot. Also CAPTCHA is a very good secure for users from spam bots.

[lennonrowen]

A Captcha 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 a computer asking a user to complete a simple test which the computer is able to grade. These tests are designed to be easy for a computer to generate, but difficult for a computer to solve, so that if a correct solution is received, it can be presumed to have been entered by a human.

[mageworld123]

i think this link can considerably help you deal with this problem: https://kb.wisc.edu/cae/page.php?id=8232

[AvaGray]

Captcha means Completely Automated Public Turing test to tell Computers and Humans Apart. It is a challenging test to ensure that the response is only generated by human and not by computer. Captcha protect websites against spammers

[virtueinfo11]

@Oracle Thanks for you infomatic post all most folks talking about CAPTCHA feature and how to use but you are great you define all the thing..
Thanks

[johncruze]

hello friends, can any body tell me about captcha. And can any body help me how to put it in my website. thanks for help...

CAPTCHA is a tool that validates that form and the fields data entered in it is coming from a real person and not something automated.

to install it on your website go to : captcha.net and sign up, once sign up, they ill give u API key, after that download the captcha script as zip file and use that script any where you want... Thanks

[ahsanabrar]

Captcha is a verification code when we are submitting or registering our self on a website.This is for block spamming or spammers.

[graphics art]

CAPTCHA is the way to insure your site not used by some kind of software or else reboots.

[mattdamon]

Captcha is used for controlling the spammers. You can get captcha code from php at a low cost.

[dotnetcreator]

A CAPTCHA is a program that can generate and grade tests that humans can pass but current computer programs cannot.

[mitapaul16]

A CAPTCHA is a program that defends a websites against spiders by producing and rating assessments that people can pass but existing applications cannot. For example, people can read distorted text, but current computer applications can't.

[robinpeterson12]

Captcha is a system through which it can be verified that whether human is their or there is any automated robot doing the text entries or directory submission.

[Raju]

It is a techniques used by most of the form submission sites to secure from automatic submission ,or prevent the form submission rules by any automated submission tool.

[introspective12]

It is a program that can grade tests that human can pass. A CAPTCHA is a type of chalange responce test used in the computer.

[Repfixer]

A Captcha is a type of challenge-response test used in computing to ensure that the response is not generated by a computer.

[abhirampathak3]

CAPTCHA or Captcha (pronounced as cap-ch-uh) which stands for “Completely Automated Public Turing test to tell Computers and Humans Apart” is a type of challenge-response test to ensure that the response is only generated by humans and not by a computer.

[johnsmith965]

In a CAPTCHA test (an acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart," also sometimes spelled in lowercase), an image of letters is dynamically generated. The letters, because they're part of an image and not text (e.g. text that you could cut and paste), are difficult for a spambot or other computer program to read. Yet, a person has little trouble reading the letters in a captcha image.

Using a captcha test on a website is a great way to ensure, for instance, that a person and not a spambot is filling out a web form. Also, a captcha can make it difficult for a person to continuously resubmit form information and overwhelm the form's purpose.


Thanks for this nice information....
Can you tell me that how can i create captcha in php coding.

[theavi]

Captcha is verification code which is used for verification and used to stop spam.it can be a code, an image.

[lucasyesher]

It is generally use for security purpose it is human verification code.

[jaagitthe]

A CAPTCHA is a program that can generate and grade tests that humans can pass but current computer programs cannot.

[partapamit]

Captcha is used to protect website forums from auto submissions.

[brianvitori12]

This CAPTCHA thing is really one of the measures to stop automated bots from filling up online forms. It is a good measure to stop spamming in the web.

[jayanta1]

A CAPTCHA is a type of challenge-response test used in computing as an attempt to ensure that the response is generated by a human being. The process usually involves a computer asking a user to complete a simple test which the computer is able to grade. CAPTCPA is mainly used to prevent automated software (bots) from performing actions on behalf of actual humans.

[jackson00]

hey .. Captcha is a random sting... On every refresh, It gives different words..

[anthonymartin78]

Captcha is a way by which automated robotic text input possibility can be minimized or eradicated at all. The problem of receiving spam emails can be solved with this.

[jonathan321]

CAPTCHA (Completely Automated Turing Test To Tell Computers and Humans Apart) is a type of challenge-response test used to ensure that the response is not generated by a computer.

A Captcha encoder is a program that can generate and grade tests that most humans can pass, but which current computer programs fail.

[JamieSpruson]

A CAPTCHA is a type of challenge-response test used in computing as an attempt to ensure that the response is generated by a human being.

[preeti22]

A CAPTCHA is a type of challenge-response test used in computing as an attempt to ensure that the response is generated by a human being.The process usually involves a computer asking a user to complete a simple test which the computer is able to grade.

[mslherry]

CAPTCHA is a security test put forth to prevent automated requests from computers from reaching the servers.:D

[rob_marin]

Captcha is a program that can generate and grade tests that humans can pass but current computer programs cannot.

online auction software (http://www.softbizscripts.com/online-auction-software.php)

[spygovind]

more known about captcha please check this link
http://www.google.com/recaptcha/captcha

[JascintaFedrick]

The term CAPTCHA (for Completely Automated Public Turing Test to Tell Computers and Humans Apart). It is a technique used by the computer for online typing test that is easy for humans to pass. For captcha code just downloads the source file from the internet.

[graphics art]

Captcha is a way of fillter the software users and stop the spaming.

[angelolee88]

It is to be noted that the thing called as the CAPTCHA was really brought into existence for the prevention of this thing called as spamming that is totally prevalent these days.

[addictiveharish]

Captcha which stands for Completely Automated Public Turing test to tell Computers and Humans Apart, is a type of challenge response test to ensure that the response is only generated by humans and not by a computer.

[richardomartin1]

Captcha is a confirmation process for human minds. It is put in place to minimize the usage of spams and adulterations. This a very effective way of detecting any non human presence.

[canadian678]

A CAPTCHA is a web program, it is used for Human Verification. It is one of the Challenge response test and it is used for computing as an attempt to ensure generated by a Human. Captcha Stands for “ Completely Automated Public Turing test to tell Computers and Humans Apart”.

[Martinguptill12]

Captcha is a tool that stops any filing of online forms and email addresses by computer automated software. This is really very useful one to restrict sending of countless spam emails.

[graphics art]

Captcha is simple plugin that we instal on our sites for avaoid spamy things on the site.

[kencurtis16]

Hello...
Captcha was a helpful tool to keep free from spambot...

[semaphore.v]

CAPTCHAs now use pictures instead of words where the user is presented with a series of pictures and asked what is the common element among all of the pictures.

[Andymurray715]

Humans use the Captcha in order to indicate to search engines that they are not one of those webs based bots that fill in forms in sites.

[digital forum]

CAPTCHA is "Completely Automated Public Turing Test To Tell Computers and Humans Apart"

[innovativeweb]

Hello Guys,

Thank you very much for your help.Captcha is good thing to prevent from spam.

[aishasony]

CAPTCHA or Captcha which stands for “Completely Automated Public Turing test to tell Computers and Humans Apart” designed to differentiate humans from automated programs. A CAPTCHA differentiates between human and bot by setting some task that is easy for most humans to perform but is more difficult and time-consuming for current bots to complete.

[martinbrown786]

The use of Captcha is an attempt to bypass the spammers. Captcha reflects an image and you need to enter the text in the box itself.

[sanamgupta]

a computer program or system intended to distinguish human from machine input, typically as a way of thwarting spam and automated extraction of data from websites.

[divorceclass]

A CAPTCHA is a program that protects websites against bots by generating and grading tests that humans can pass but current computer programs cannot.

[markellis312]

Captacha just like a Verification code.

[paulbrighton]

Captcha is a program or system intended to distinguish human from machine input.

[robertmiker]

CAPTCHA is to ask for human verification.

[netxsolution]

Captcha is the best thing , actually captcha is the difficult wording mixture , which helps you save your website, software with any type of spamming and bulking. thanks

[DoloresPiper]

A captcha is a program which is used to distinguish human from machine. It is a way of catching the spammers and automated extraction of data from website.

[singhabhishek25]

I do not believe that there could be 322 reply for this simple question somewhere and this is 323rd, but obviously not an answer,but a concern for the spamming. I am wondering how many varieties of answer can be found here. I am going to read all of them one by one.

[christopher12]

captcha is the verification code for verificatio

[123johnsin]

verification code is called captcha.

[harry26]

captcha is need for any website for stop to automated spam or only authorize unique visitors to access any site.

[Bluesky94]

A CAPTCHA (a backronym for "Completely Automated Public Turing test to tell Computers and Humans Apart") is a type of challenge-response test used in computing to determine whether or not the user is human.
The term was coined in 2003 by Luis von Ahn, Manuel Blum, Nicholas J. Hopper, and John Langford.The most common type of CAPTCHA was first invented in 1997 by two groups working in parallel: (1) Mark D. Lillibridge, Martin Abadi, Krishna Bharat, and Andrei Z. Broder; and (2) Reshef, Raanan and Solan. This form of CAPTCHA requires that the user type the letters of a distorted image, sometimes with the addition of an obscured sequence of letters or digits that appears on the screen. Because the test is administered by a computer, in contrast to the standard Turing test that is administered by a human, a CAPTCHA is sometimes described as a reverse Turing test.