Text Verification

H

Hugh Welford

Hi, Does anyone know how to inplement the text verification facility that
can be seen on some sign-up pages where you have to type in the characters
that you can see in a box in order to prevent automated registration
scripts

Thanks Hugh
 
T

Thomas A. Rowe

Most of those, such as used by Network Solutions Whois function are
dynamically generated random numbers/characters displayed as a image, but
also stored in a session so that it can be validated.

This requires an application or component to be installed on the server to
generate the images and stored the value in a session.

--

==============================================
Thomas A. Rowe (Microsoft MVP - FrontPage)
WEBMASTER Resources(tm)

FrontPage Resources, WebCircle,
MS KB Quick Links, etc.
==============================================
 
J

Jon

Hi Hugh,
You'd start with a list of words then pick one at random stick it in a
session var and create an image of the text. If you have ASP on your server
you could use something like ASPImage (www.serverobjects.com) to generate an
image of the text. If you can use asp.net even easier - system.drawing will
let you create images without needing any extra components. For a "low
budget" solution I suppose you could create say 50 images of text in your
graphics program and pick one out at random, stick the image name in a
session var and when the user submits the form check the word he typed is
the same as the random image you picked.

Jon
Microsoft MVP - FP
 

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