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A CAPTCHA (/ ˈ k æ p. tʃ ə / KAP-chə) is a type of challenge–response test used in computing to determine whether the user is human in order to deter bot attacks and spam. [ 1 ] The term was coined in 2003 by Luis von Ahn , Manuel Blum , Nicholas J. Hopper, and John Langford . [ 2 ]
Challenge-response protocols are also used in non-cryptographic applications. CAPTCHAs, for example, are meant to allow websites and applications to determine whether an interaction was performed by a genuine user rather than a web scraper or bot.
In 2013, reCAPTCHA began implementing behavioral analysis of the browser's interactions to predict whether the user was a human or a bot. The following year, Google began to deploy a new reCAPTCHA API, featuring the "no CAPTCHA reCAPTCHA"—where users deemed to be of low risk only need to click a single checkbox to verify their identity. A ...
An Internet bot, web robot, robot or simply bot, [1] is a software application that runs automated tasks on the Internet, usually with the intent to imitate human activity, such as messaging, on a large scale. [2] An Internet bot plays the client role in a client–server model whereas the server role is usually played by web servers. Internet ...
Bots can be blocked by monitoring excess traffic; Bots can sometimes be blocked with tools to verify that it is a real person accessing the site, like a CAPTCHA. Bots are sometimes coded to explicitly break specific CAPTCHA patterns or may employ third-party services that utilize human labor to read and respond in real-time to CAPTCHA challenges.
Changing technical details of the forum software to confuse bots — for example, changing "agreed=true" to "mode=agreed" in the registration page of phpBB. [5] Blocking posts or registrations that contain certain blacklisted words. Monitoring IPs used by untrusted posters, like anonymous posts or newly registered users. A useful technique for ...
Various fingerprinting and behavioural techniques are used to identify whether the client is a human user or a bot. In turn, bots use a range of techniques to avoid detection and appear like a human to the server. [2] Browser fingerprinting techniques are the most common component in anti-bot protection systems.
An automated threat is a type of computer security threat to a computer network or web application, characterised by the malicious use of automated tools such as Internet bots. [1] Automated threats are popular on the internet as they can complete large amounts of repetitive tasks with almost no cost to execute. [2]