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This CAPTCHA (reCAPTCHA v1) of "smwm" obscures its message from computer interpretation by twisting the letters and adding a slight background color gradient.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.
reCAPTCHA Inc. [1] is a CAPTCHA system owned by Google.It enables web hosts to distinguish between human and automated access to websites. The original version asked users to decipher hard-to-read text or match images.
A common counter-measure is to show the user an image of colored or distorted text, known as a CAPTCHA, and ask them to type the words shown. Since answering a CAPTCHA is a task that is hard to automate, it will allow most real humans to make their posts while stopping most spammers and other robotic attackers.
Using a key derivation function, the challenge value and the secret may be combined to generate an unpredictable encryption key for the session. This is particularly effective against a man-in-the-middle attack, because the attacker will not be able to derive the session key from the challenge without knowing the secret, and therefore will not ...
The CAPTCHA system is commonly used online to tell humans and bots apart on the internet. It is based on the Turing test. Displaying distorted letters and numbers, it asks the user to identify the letters and numbers and type them into a field, which bots struggle to do. [18] [58] The reCaptcha is a CAPTCHA system owned by Google. The reCaptcha ...
Draw-a-Secret is a type of graphical password that requires the user to draw a picture over a grid. The user must exactly remember the user-drawn gestures in order to be authenticated.
Hardware authentication security keys. Multi-factor authentication (MFA; two-factor authentication, or 2FA, along with similar terms) is an electronic authentication method in which a user is granted access to a website or application only after successfully presenting two or more pieces of evidence (or factors) to an authentication mechanism.
Address munging is the practice of disguising an e-mail address to prevent it from being automatically collected by unsolicited bulk e-mail providers. [1] Address munging is intended to disguise an e-mail address in a way that prevents computer software from seeing the real address, or even any address at all, but still allows a human reader to reconstruct the original and contact the author ...