>>>>>>>>>>>>>>>>>>>>>>>>>>What is a Captcha?
A Captcha is an anti-spam technology for form fields and other interactive web page elements to distinguish human input from automated queries by spam bots. Spam bots are thus prevented from placing automated advertisements. The term stands for“Completely Automated Public Turingtest to tell Computers and Humans Apart.”
What are the types of Captchas?
Often, distorted strings of letters or numbers are presented that spam bots cannot easily decipher. On accessible websites, audio files are offered as an alternative to graphics for deaf and hearing-impaired people. In addition to the actual audio content, these files also contain noise that is intended to prevent spam bots from recognizing the content. Google often uses images from Street View on which the user is supposed to recognize certain objects. Logic-Captchas are simple puzzles and queries, such as simple math problems or completing a sentence.
How safe are Captchas?
The operators of spam bots are constantly developing new scripts to trick the various types of Captchas. The ultra-secure Captcha will not exist in the future. Captcha -procedures must therefore be constantly adapted.
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