CAPTCHA STANDS FOR..........
A captcha is a program that can generate
and grade tests that:
- Most humans can pass, but
- Current computer programs can't pass.
Such
a program can be used to differentiate humans from computers and has many
applications for practical security.
CAPTCHA
stands for "Completely Automated Public Turing Test to Tell Computers and Humans
Apart."
The
P for Public means that the code and the data used by a CAPTCHA should be
publicly available. The T for "Turing Test to Tell" is because
CAPTCHAs are like Turing Tests. In the original Turing Test, a human judge was
allowed to ask a series of questions to two players, one of which was a
computer and the other a human. Both players pretended to be the human, and the
judge had to distinguish between them. CAPTCHAs are similar to the Turing Test
in that they distinguish humans from computers, but they differ in that the
judge is now a computer.
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