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AOL Mail uses many security measures to keep your account secure, one of which is CAPTCHA or image challenges when sending mail. These challenges exist to make it harder for hackers to access your accounts. The characters can't be read by a computer and must be entered manually, ensuring only a real person can pass the test. Why am I being ...
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.
Internet bots are able to perform simple and repetitive tasks much faster than a person could ever do. The most extensive use of bots is for web crawling, in which an automated script fetches, analyzes and files information from web servers. More than half of all web traffic is generated by bots. [3] Efforts by web servers to restrict bots vary.
The "captcha challenges" in this article, in both the 2007 and 2009 examples, are not a single challenge as the text makes them out to be but the computer generated words from two separate captchas put onto a single image. This is relatively easy to tell with experience, and is both inaccurate and annoying.
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This could be people using CAPTCHA's to get humans to read words which OCR software has failed to read properly (maybe due to a blot on the book). This is automated so that the OCR software combined with humans works much better. QuentinUK 12:36, 12 March 2011 (UTC)
Various anti-spam techniques are used to prevent email spam (unsolicited bulk email).. No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) as opposed to not rejecting all spam email (false negatives) – and the associated costs in time, effort, and cost of wrongfully obstructing good mail.