To ensure that the response is not generated by a computer. The process usually involves one computer (a server) 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 random math equation, any user entering a correct solution is presumed to be human. It can also be treated as is a type of challenge-response test.
On Sat, Jul 18, 2009 at 6:14 PM, Anand <[email protected]> wrote: > > hi, > > if see some site like fields in registration > > * (Spam protection) What is the sum of 15 + 17? > > Human check > Some simple math 1+19 > > Why want to like this ?,if u know this > -- Jay
