Generate Scrambled Text for Security

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Ben - 27 Jul 2007 21:36 GMT

Hi,
I am looking to incorporate the scrambled text functionality (a graphic
etc with scrambled text appears and the user is required to type in what
he sees to prevent anonymous hits/spamming etc. - security feature
available in most credit card /banking websites). Any pointers to where
I can start?

Thanks,
Ben

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Mark Rae [MVP] - 27 Jul 2007 21:53 GMT

Ben,

> I am looking to incorporate the scrambled text functionality (a graphic
> etc with scrambled text appears and the user is required to type in what
> he sees to prevent anonymous hits/spamming etc. - security feature
> available in most credit card /banking websites). Any pointers to where
> I can start?

I assume you're referring to a CAPTCHA control like this:
http://www.markrae.net/net/mail.aspx

There are loads of examples of this:
http://www.google.co.uk/search?sourceid=navclient&hl=en-GB&ie=UTF-8&rlz=1T4GGIH_
en-GBGB220GB220&q=%22ASP%2eNET%22+Captcha

All I did was pick the one I liked the best and then made a few small mods
for my own needs...

Signature

Mark Rae
ASP.NET MVP
http://www.markrae.net

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Peter Duniho - 27 Jul 2007 21:56 GMT

http://www.google.com/search?q=captcha

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rossum - 27 Jul 2007 21:59 GMT

>Hi,
>I am looking to incorporate the scrambled text functionality (a graphic
[quoted text clipped - 7 lines]
>
>*** Sent via Developersdex http://www.developersdex.com ***

Google "CAPTCHA": Completely Automated Public Turing test to tell
Computers and Humans Apart

http://www.captcha.net/

rossum

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Alun Harford - 28 Jul 2007 12:28 GMT

> Hi,
> I am looking to incorporate the scrambled text functionality (a graphic
> etc with scrambled text appears and the user is required to type in what
> he sees to prevent anonymous hits/spamming etc. - security feature
> available in most credit card /banking websites). Any pointers to where
> I can start?

You're after a CAPTCHA.
Telling the difference between cats and cars is *so* much better than
the bad text ones though. Decent OCR will break them frequently (and a
spammer can compensate for the fact that 90% of the spam is stopped, by
sending 10x the spam), and I can't read a significant number of them.

Alun Harford

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Ben - 30 Jul 2007 16:21 GMT

Thanks to all for your quick response. I will try it out and let you all
know.
Ben

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Generate Scrambled Text for Security

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