What is CAPTCHA?
It is clear that CAPTCHA is an abbreviation. The question is, what does it mean for? The answer is quite simple, as is the purpose of CAPTCHA. CAPTCHA or A completely automated Turing-test public test, which tells computers and people separately, is used to log robots and other automated programs to offer, collect or register for e-mail addresses, violations of privacy, attempt to spray passwords or send spam for not completing e-mail recipes. CAPTCHA works by issuing a challenge to a person or entity trying to access.
CAPTCHA prompt is usually a simple visual test or puzzle that the observed person can complete without much difficulty, but the automated program does not understand. The test usually consists of letters, numbers or other images that overlap or intersect. Images are somehow distorted or displayed against a complex background to be easily read by another computer. One examples is
gimpy . Gimpy is an atyp of a captain who selects short random words from the dictionary and creates seven puzzles, such as those described above from words. The user must then properly guess at least three of these words to continue. pix is another interesting example, and as the name suggests, it uses images to create a challenge. This system provides six images on the same topic and requires the user to determine the item.
Unfortunately, CAPTCHA technology is found in some problems. The individual affected on the eyes will not be able to respond to this challenge without help. There is also a question of tireless spammers and others who hope to take advantage of the online community, who continue to develop sophisticated programs for decrypting CAPTCHA images. Although CAPTCHA technology is constantly updated, there may still be problems, especially when images must become more of more chamfers to deceive robots. Some CAPTCHA images are even difficult to interpret for people and can avert legitimate clients or customers.
Despite apparent problems, CAPTCHA works quite well in many environments. It prevents the unspeakable number of robots in registration for thousands of e -mail addresses every day that would be used to send spam. It is an excellent tool, but it continues to improve on it, it will require devoted people and careful attention to detail to keep up with the new SPAMMER tricks.