What is captcha Entry ?
A Captcha entry is a type of challenge-response
test used in computing to determine that the user is not run by a computer. The
process involves one computer 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 entry , any user entering a correct solution is
presumed to be human. A common type of captcha entry 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. The most common captcha entry device is to present an image of letters
slightly distorted so an optical reader cannot make them out, but the human
mind still can. The human recognizes each letter and types it in the order
presented to prove he is in fact human. Captcha entry is good job .
Identification:
A captcha entry image typically consists of one or more words distorted in
some way to make them difficult for character recognition software to read. The
distortions include warping the letters, drawing lines through them, packing
them closely together and placing them on a multicolored background. Near the
captcha entry
image is an empty field
where you must type the contents of the image before you can submit the form.
Captcha entery identification need every site.
Purpose and Benefits
Spammers create automated programs to create online accounts and send
unsolicited messages through free Web-based email services. A captcha entry
test is designed to prevent these automated
programs from working by distorting the letters in the test image enough that a
computer cannot recognize them, while a human can. When captcha entry
tests work successfully, they eliminate the
possibility of spammers using automated means to send spam.
Accessibility
Captcha entey tests are visual in nature; one must be able to see the words
in the image to type them. Captcha entry
tests are designed to foil character
recognition software. Unfortunately, the same character recognition software is
used to help the blind use computers. Many captcha entry tests have icons that
you can click to have the words in the image read by a speech synthesizer.
However, the quality of the speech synthesizer is often poor, and all websites
do not offer this option yet. In some cases, this can make a website unusable
for a disabled person without assistance.
Limitations
Captcha entry a is not a foolproof method for deterring spammers. A
determined individual can still send spam manually by solving captcha entry tests
himself or by hiring others to do so. In addition, it may be possible to
improve character recognition algorithms to solve captcha entry tests with a
computer or to hack the code that generates the test.
