captcha

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capt·cha

 (kăp′chə) Computers
n.
A security feature, as on a webpage, that attempts to distinguish between legitimate human users and bots by requiring users to perform a mildly challenging task such as deciphering distorted text.

[Acronym of c(ompletely) a(utomated) p(ublic) T(uring test to tell) c(omputers and) h(umans) a(part), coined in 2000 by the researchers who developed the security feature and intended to suggest a colloquial pronunciation of capture.]

captcha

(ˈkæptʃə)
n
(Communications & Information) a test in which the user of a website is asked to decipher a distorted image, used to protect the website against automated attacks
[C21: acronym for C(ompletely) A(utomated) P(ublic Turing Test to) T(ell) C(omputers and) H(umans) A(part)]
References in periodicals archive ?
Once the system is trained on what to detect in the scanned tissue images, it can be used to analyse new samples and bring quantitative and qualitative information for human verification.
Steven Hickson hacked the recent human verification system that requires new users to identify pictures that contain the company's ghost logo out of a collection of images.
In detail, the possible connections between the complexity and intrinsic variability of signatures and its effect on human verification processing are very important issues in developing strategies for practical biometric system.
With this product, employees simply look at the device and within seconds, they are identified, clocked in/out or admitted into secure locations, making it one of the most intelligent human verification systems on the market.
The level, nature, and frequency of the human verification will vary depending on the level of automation used and nature of the system and controls.
The result is real-time promotional messages delivered as soon as the promotion is ready, supported by human verification.
Combined with human verification, this effectively reduces spam 100%, yet still provides a wide assortment of listings.
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