Verififying Image Characters

Discussion in 'ASP General' started by rn5a@rediffmail.com, Apr 29, 2007.

  1. Guest

    Nowadays, while registering at a site, an image with alphanumeric
    characters is displayed to users who are asked to enter those
    alphanumeric characters in a textbox to avoid automated registration.

    Are such images generated dynamically? Or is it something like the
    sites have thousands & thousands of images with random alphanumeric
    characters at their disposal? I don't think it could be the latter
    though I am not sure about it. Assuming that the images with
    alphanumeric characters are generated dynamically, how can this be
    done using ASP?

    Moreover, the text entered by users are also validated against the
    text on the image. How can this be done using ASP?

    Thanks......
     
    , Apr 29, 2007
    #1
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