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captchawork
What is Captcha?
If you ever fill out a form on the internet, such as registering the email and so on, surely you've seen pictures of crooked letters or chaotic as in the picture, then asked to write the letters in a text box. What are the letters? What's the point?
Picture letters turmoil, called a CAPTCHA (Completely Automated Public Turing Test to Tell Computers and Humans Apart). This is one application of the method that initiated the Turing Test by Alan Turing in 1950. Useful to ensure that the form filler is really a human being. The computer program will have difficulty in deciphering the letters that twisted or stacked while the man is still a (somewhat) easy to read.
Before there is a CAPTCHA, spammers / hackers can create a program to automatically fill out registration forms such as free email, so he will get thousands of email addresses for later easily be abused.Or to change the results of an online poll, a person could have made a simple program to fill out the poll with the same answer as many as thousands or even millions of times. As a result, the poll certainly becomes invalid.
To prevent programs like it, now all of the form will display the CAPTCHA is an image or crooked letters connect to each other which are difficult to read by a program or computer, but the (relatively) human readable. If the filling of form filler according to the images displayed, then the most likely form filler is a human, not computer programs.
CAPTCHA is usually made automatically at random every time someone entered in the web form page, so that almost no two similar CAPTCHA. This makes the number of combinations that may appear very, very much, making it nearly impossible to create a program that is able to remember and answer a CAPTCHA that will appear.In addition to visual CAPTCHA that we often encounter, there is also an audio version for people with disabilities the eye, with approximately the same principle.
Currently there are initiatives to utilize CAPTCHA for positive purposes. To save the important archives in the world, in many countries there is now responsible parties to change an existing file formats (books, printed documents) into a digital format (computer file). The two main obstacles that came up was the large number of records that are stored for hundreds of years, and poor print quality, so its difficult to scan results recognized by the computer. With the combination of these two constraints, it is almost impossible to pay for a human to read it manually archive the failed computer readable.
To overcome this problem now appears re-CAPTCHA, a system that works together with Google Books and The Internet Archive, which archives scans failed to read the computer is displayed as a CAPTCHA, then the field was regarded as the text is missing / illegible. To be sure the text is correct, it is usually not just one answer that is used, but up to ten or more of the same answer.
It's a win-win solution for all parties. For owners of web-form, he got a CAPTCHA that is not recognizable by the super-sophisticated computers used for the process of digitizing the archives, so that the hackers also the difficulty of making a program that is able to read it. And for the archive format modifiers, with so many forms that filled all over the world every day, re-CAPTCHA can help digitizing archives quickly and for free.So when filling out forms on websites that work together to re-CAPTCHA, you've helped save the archives of the world for our children and grandchildren all.
Unfortunately after all these years is implemented, the CAPTCHA systems have started to show some weakness. Development of hardware and software makes it no longer too difficult to be solved by the program. Especially now emerging companies in the third world who are willing to solve the CAPTCHA with a very low cost. DeCaptcher.com willing to solve the CAPTCHA with only U.S. $ 2 per 1000 CAPTCHAs.To overcome this, recently, other parties such as Carnegie Mellon University and Penn State is developing an image-based CAPTCHAs, no longer the case.
Picture letters turmoil, called a CAPTCHA (Completely Automated Public Turing Test to Tell Computers and Humans Apart). This is one application of the method that initiated the Turing Test by Alan Turing in 1950. Useful to ensure that the form filler is really a human being. The computer program will have difficulty in deciphering the letters that twisted or stacked while the man is still a (somewhat) easy to read.
Before there is a CAPTCHA, spammers / hackers can create a program to automatically fill out registration forms such as free email, so he will get thousands of email addresses for later easily be abused.Or to change the results of an online poll, a person could have made a simple program to fill out the poll with the same answer as many as thousands or even millions of times. As a result, the poll certainly becomes invalid.
To prevent programs like it, now all of the form will display the CAPTCHA is an image or crooked letters connect to each other which are difficult to read by a program or computer, but the (relatively) human readable. If the filling of form filler according to the images displayed, then the most likely form filler is a human, not computer programs.
CAPTCHA is usually made automatically at random every time someone entered in the web form page, so that almost no two similar CAPTCHA. This makes the number of combinations that may appear very, very much, making it nearly impossible to create a program that is able to remember and answer a CAPTCHA that will appear.In addition to visual CAPTCHA that we often encounter, there is also an audio version for people with disabilities the eye, with approximately the same principle.
Currently there are initiatives to utilize CAPTCHA for positive purposes. To save the important archives in the world, in many countries there is now responsible parties to change an existing file formats (books, printed documents) into a digital format (computer file). The two main obstacles that came up was the large number of records that are stored for hundreds of years, and poor print quality, so its difficult to scan results recognized by the computer. With the combination of these two constraints, it is almost impossible to pay for a human to read it manually archive the failed computer readable.
To overcome this problem now appears re-CAPTCHA, a system that works together with Google Books and The Internet Archive, which archives scans failed to read the computer is displayed as a CAPTCHA, then the field was regarded as the text is missing / illegible. To be sure the text is correct, it is usually not just one answer that is used, but up to ten or more of the same answer.
It's a win-win solution for all parties. For owners of web-form, he got a CAPTCHA that is not recognizable by the super-sophisticated computers used for the process of digitizing the archives, so that the hackers also the difficulty of making a program that is able to read it. And for the archive format modifiers, with so many forms that filled all over the world every day, re-CAPTCHA can help digitizing archives quickly and for free.So when filling out forms on websites that work together to re-CAPTCHA, you've helped save the archives of the world for our children and grandchildren all.
Unfortunately after all these years is implemented, the CAPTCHA systems have started to show some weakness. Development of hardware and software makes it no longer too difficult to be solved by the program. Especially now emerging companies in the third world who are willing to solve the CAPTCHA with a very low cost. DeCaptcher.com willing to solve the CAPTCHA with only U.S. $ 2 per 1000 CAPTCHAs.To overcome this, recently, other parties such as Carnegie Mellon University and Penn State is developing an image-based CAPTCHAs, no longer the case.
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It's a win-win solution for all parties. For owners of web-form, he got a CAPTCHA that is not recognizable by the super-sophisticated computers used for the process of digitizing the archives, so that the hackers also the difficulty of making a program that is able to read it. And for the archive format modifiers, with so many forms that filled all over the world every day, re-CAPTCHA can help digitizing archives quickly and for free.So when filling out forms on websites that work together to re-CAPTCHA, you've helped save the archives of the world for our children and grandchildren all.NAH NOW THERE ARE STILL WORKING ON PREJUDICE BAD ONLINE CAPTCHA typing?
