ITPEC FE Morning April 2018 Question 36
Which of the following is a technology that prevents automated input by a program by requiring input of characters from a warped image or an image some parts of which are hidden? The technology is based on the differences of recognition of those images between humans and programs.
Explanation
CAPTCHA — a test that shows distorted or partly hidden characters that people can read but programs struggle to recognise.
CAPTCHA stands for Completely Automated Public Turing test to tell Computers and Humans Apart. It is placed on sign-up, login and comment forms so that bots cannot submit them automatically in bulk.
Answer (a)
Why not others:
- •(b) QR code — a two-dimensional code that stores data such as a URL for a camera to read; it is meant to be read by machines
- •(c) Short URL — a short alias that redirects to a long URL
- •(d) Trackback ping — a message one blog sends to another to notify it that a post links to it
Key rule: CAPTCHA relies on a task that is easy for humans and hard for programs, so passing it is taken as evidence that a person is at the keyboard.
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