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 ?
Darwish et al., "Human Authentication using Face and Fingerprint Biometrics," in Proc.
By involving time-bound personal human authentication, the service is definitely secure.
Among the topics are developments in biometrics for a secure human authentication system: a biometric authentication system, combating cyber security breaches in digital world using misuse detection methods, ATM security systems identifying human behavior by critical video surveillance, the effective recognition of stereo image concealed media of interpolation error with difference expansion, and visual cryptography for securing images in cloud.
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