Skip to main content
captcha

captcha

1 5.6
A test on a website that checks if a user is a human not a robot
  • noun
  • /ˈkæp.tʃə/
  • Texting
translation icon : captcha
  • And another thing that attackers can do is they can actually reuse captures on legitimate sites.
  • solve a captcha

So, OK, so and this thing performed pretty well on the Captchas, correct.

Examples

  • On the Internet, users must fill out a captcha to prove they are not automated programs.

  • Most major Internet companies implement captchas to prevent bots from accessing their services.

  • The problem seems to be with the signup page's captcha security box.

    Blog text (10)
  • I'm filling in the captcha and am using a different email this time to see if it's still automatic...

    Blog text (10)
  • BTW, I like your captcha quizzes.

    Blog text (11)
  • Thanks for the nice article, Tim, even though I am typing this a second time since the first time I supposedly entered the wrong captcha text and everything got erased. Oh well.

    Blog text (24)
  • Not to mention, the overall journey through the web would be a way more enjoyable ride without having to stop every two minutes to enter your username and password—and maybe even solve one of those uber-annoying captchas you have to tilt your head and squint at in order to make out here and there.

    Blog text (17)
  • Many sites around the web use a type of challenge-response test called a captcha to verify that users are human.

How Secure

two-step
  • Texting
3 3.9
captcha
  • Texting
1 5.6
verification
  • Texting
3 3.8
review
490 3.0

Surface Forms

captcha singular
captchas plural

Morphology

captcha = C + A + P + T + C + H + A

This is an acronymic coinage from a longer phrase, so the written form does not transparently expose the meaning.

Etymology

Captcha comes from the phrase Completely Automated Public Turing test to tell Computers and Humans Apart, a long name made into a short word. It is like a tiny 'Turing test' on a website to prove you are a 'human' and not a 'robot', which is why CAPTCHAs stop automated spam.