Ambigram Captchas

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2 Comments

  1. 1
    E O'Hare Says:

    An interesting twist to the field of captcha. However if I invert the upright “aunt” using the Windows Paint program, I get “nince not “niece”. I am not able to visually turn the ‘n’ into an ‘e’. Am I missing something?

    For another line of thought, see the link discussing video captcha:
    http://www.kloover.com/thesis/thesis.pdf

  2. 2

    @E O’Hare: Thanks for sharing the link to my thesis :-) For a shorter description and demo of the Video CAPTCHA, check out: http://www.kloover.com/video-captchas

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