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...
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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...
I believe that first of all you need to do the search for it. As ussual that is paid
So are you ready to pay for the captcha?
Captcha is something which was created to stop automated computer spam robots from filling out forms, harvesting email addresses, and then sending out countless spam emails.
There are free captcha's that you can get but as far as I've experienced, they don't stop a great deal of bots because they're pretty simple, for example a few digits perfectly lined up.
the best is "recaptcha" and most of all its free. they provide great api so you can easily integrate in your code.
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.
A CAPTCHA or Captcha (IPA: /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 letters or digits from a distorted image that appears on the screen
you can search for captcha from php tutorial.
In my personal opinion I would say reCAPTCHA is the best CAPTCHA script out there. Works for me. ;)!
Hello
agree with Oracle
Captcha is something which was created to stop automated computer spam robots from filling out forms, harvesting email addresses, and then sending out countless spam emails
captcha is the verification code you enter for verification.
Captcha is mainly used for thwarting the attempts of the spammers. Here an image is being placed which one has to write on a given box before submitting anything or before proceeding further.
HI,
A CAPTCHA or Captcha (pronounced /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 letters or digits from a distorted image that appears on the screen.
I know wiki is great source ;)Quote:
Originally Posted by jamesdurai
dont know........ toooo lol..........
Usually, how does it cost if you subscribe for a captcha service? Many websites are really doing applying this to avoid spams. At first, I was really wondering what is it all about and what it is for but eventually, I got it! And it is very important for websites that require registration.
A CAPTCHA or Captcha is a type of challenge-response test used in computing to ensure that the response is not generated by a computer.
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......................
A captcha is a sort of way to catch spam bots on the web. The best and simplest way to implement one of them to protect your sites is http://www.recaptcha.net
I hate captcha most of the times as they are usually beyond recognition that makes me struggling to get the correct captcha code. I must say that it is better to use some arithmetic question in replacing those awful captcha code.
Hi
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.
The new and improved Recaptcha is like captcha, but accessible to the blind and involves its users in a public effort to digitze old books and periodicals. Learn more here.
Thanks
Have a nice time head.
Captcha is something which was created to stop automated computer spam robots from filling out forms, harvesting email addresses, and then sending out countless spam emails.
Had this problem, patch works nice (manually aplied because i allready patched for guestbook usage and never 64 version), THX.
What a pity no activity in this area for so long time.
If you are using wordpress, you can get plug-ins that provide captcha for free. This will help minimize spammers from posting irrelevant comments in your site.
wish they would add captcha to these forums O_o
CAPTCHA is usually a random image or alphanumeric shown on blogs for comment forms or even signing-up on forums to avoid spam contents and automatic sign-ups and auto-commenting. Its a great anti-spam tool.
Hello Friends....
CAPTCHA typically involves a computer which 'serves up' a puzzle (this usually involves number and/or letter combinations) that a user has to input into a designated box in order to proceed with whatever process the CAPTCHA is guarding
Thanks
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.
This is just the code of verification which confirms that the user is a human or any bot for saving the website from spammers or bulk submitter.
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..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.For users who have a solid grounding in PHP and how HTML forms work, this example will show how to implement a captcha .
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PC TV
The term CAPTCHA ---- Completely Automated Turing Test To Tell Computers and Humans Apart , for preventing spammers..
A CAPTCHA is a program that can generate and grade tests that humans can pass but current computer programs cannot.It Tells Humans and Computers Apart Automatically.. It is used to prevent Dictionary Attacks , Worms and Spam and etc..
First u must see the third party who is providing the captcha.. but it will decrease the rank of your site so u must prepare it your self. you can contact me on shelp99@yahoo.com i will send u php code that how it works and how it can be embeded into ur site.
CAPTCHA is a program that protects websites against bots by generating and grading tests that humans can pass but current computer programs cannot. For example, humans can read distorted text as the one shown below, but current computer programs can't: 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.:cool:
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.
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B&B Ballina
How about trying to google the free captcha in the net? Maybe there is one available that is reliable.
A CAPTCHA or Captcha is a type of challenge-response test used in computing to ensure that the response is not generated by a computer. ...
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Web Design London
Hello Guys,
Captcha is dynamically generated random images and you can get free scripts for it.
Visit w3schols.com
Thanks
Mark.
Captcha is a Completely Automated Public Turing test to tell Computers and Human Apart.
Captcha is an image verification module that is used to verify whether or not someone is a real person. If you have signed up for an email address before, then you have probably seen a Captcha box before. It is a strange looking image with oddly shaped characters in it, also it is very difficult for a program to decipher the image content. The Captcha box prompts the user to enter in the information sen in the image to verify that the user is indeed a genuine human being.
Hello
Captcha is an emige verification test to insure that the response is not a computer generated.This is used to prevent SPAM messages,on how to implement a catpcha on your site I sugest to hire for a web programmer :D !