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2. CAPTCHA - Wikipedia

   en.wikipedia.org/wiki/Captcha

   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.

3. reCAPTCHA - Wikipedia

   en.wikipedia.org/wiki/ReCAPTCHA

   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.

4. MediaWiki:Captcha-addurl-whitelist - Wikipedia

   en.wikipedia.org/wiki/MediaWiki:Captcha-addurl...

   # Syntax is as follows: # * Everything from a "#" character to the end of the line is a comment # * Every non-blank line is a regex fragment which will only match hosts inside URLs # # ----- # PLEASE DO NOT MODIFY THIS LIST UNLESS YOU HAVE A BASIC UNDERSTANDING OF REGEX # ----- # # ----- # Please discuss additions publicly such as at the Wikipedia:Reliable sources/Noticeboard # ----- # # This ...

5. Fix issues with AOL Mail image challenges - AOL Help

   help.aol.com/articles/what-should-i-do-if-i-get...

   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 ...

6. Challenge–response authentication - Wikipedia

   en.wikipedia.org/wiki/Challenge–response...

   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 ...

7. URL shortening - Wikipedia

   en.wikipedia.org/wiki/URL_shortening

   On Twitter and some instant messaging services, there is a limit to the number of characters a message can carry – however, Twitter now shortens links automatically using its own URL shortening service, t.co, so there is no need to use a separate URL shortening service just to shorten URLs in a tweet. On other such services, using a URL ...