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I've never output a form that prompted the user to enter the characters
represented in a Captcha image. But if you had a table on your server that
cross-referenced the character representation with the image file name, the
validation logic would just be a regular string comparison against the
appropriate table row & column, and the type of thing you could easily do in
just about any server language.
I understand that the purpose of distorting the image is to prevent it from
being converted to a character string via standard optical character
recognition, which could be employed via bot. You want to make sure the
user is more intelligent (human) than a bot.
So my question would be, is there software available that can convert
simple character strings into distorted image representation, so you can
generate your own table of prompts?
Nathan.
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