2007-05-04 04:57:35 · 5 answers · asked by Andy B 1 in Computers & Internet ➔ Security
http://en.wikipedia.org/wiki/Captcha
The Completely Automated Public Turing test to tell Computers and Humans Apart
2007-05-04 05:02:04 · answer #1 · answered by Chris S 5 · 0⤊ 0⤋
They are security images generated by the server to protect against automated scripts used to flood or mass register or send data to the server. More or less, it is to prove a person is submitting the information. They are deformed because some scripts can figure out the letters in plain-text.
2007-05-04 12:02:01 · answer #2 · answered by Anonymous · 0⤊ 1⤋
It's called "captcha" and it's sent in a manner that only the sender and the receiver can see, and so that the sender (the sending computer) must verify that the receiver (the person filling out the form) must type in so that no one else (somebody or some automated process eavesdropping on the conversation) may grab the form information and re-send it to their own spamming advantage to send garbage forms back to the sending computer...
2007-05-04 12:03:10 · answer #3 · answered by fjpoblam 7 · 0⤊ 1⤋
To verify if you are a human, and not a script.
2007-05-04 12:00:14 · answer #4 · answered by completely deck 2 · 0⤊ 1⤋
I think you're talking about a "captcha".
Read all about it here: http://en.wikipedia.org/wiki/Captcha
2007-05-04 12:01:04 · answer #5 · answered by finance_coder 3 · 0⤊ 1⤋