Acrónimos:
CAPTCHA
Ver:
Captcha es el
acrónimo de Completely Automated Public Turing test to tell Computers and
Humans Apart (Prueba de Turing pública y automática para diferenciar a máquinas
y humanos).
Se trata de
una prueba desafío-respuesta utilizada en computación para determinar cuándo el
usuario es o no humano. El término se empezó a utilizar en el año 2000 por Luis
von Ahn, Manuel Blum y Nicholas J. Hopper de la Carnegie Mellon University, y
John Langford de IBM.
La típica
prueba consiste en que el usuario introduzca un conjunto de caracteres que se
muestran en una imagen distorsionada que aparece en pantalla. Se supone que una
máquina no es capaz de comprender e introducir la secuencia de forma correcta
por lo que solamente el humano podra hacerlo (salvo error).
Como el test
es controlado por una máquina en lugar de un humano como en la Prueba de
Turing, también se denomina Prueba de Turing Inversa.
http://es.wikipedia.org/wiki/Captcha
An interactive
feature added to web-forms to distinguish use of the form by humans as opposed
to automated agents. Typically, it requires entering text corresponding to a
distorted image or from a sound stream.
[NIST-SP800-63:2013]
A CAPTCHA
(Completely Automated Public Turing Test to tell Computers and Humans Apart) is
a challenge-response system test designed to differentiate humans from
automated programs. A CAPTCHA differentiates between human and bot by setting
some task that is easy for most humans to perform but is more difficult and
time-consuming for current bots to complete.
CAPTCHAs are
often used to stop bots and other automated programs from using blogs (see
splog) to affect search engine rankings, signing up for e-mail accounts to send
out spam or take part in on-line polls.
Frequently, a
CAPTCHA features an image file of slightly distorted alphanumeric characters. A
human can usually read the characters in the image without too much difficulty.
A bot program is able to recognize that the content contains an image , but it
has no idea what the image is. To accomodate the visually-impaired, some
CAPTCHAs use audio files. In such a system, the human listens to a series of
letters or short words and types what he hears to prove he is not a bot.
http://searchsoftwarequality.techtarget.com/glossary/
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