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E-Blah suffering from spam   This thread currently has 4,332 views. Print
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Craig
May 24, 2006, 9:01am Report to Moderator Report to Moderator

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Hey, that is kind of cool.  Good job Martin.


Don't just ask a question.
Instead ask a question, give us a screen shot and post a link to your forum.
Help us help you make your forum better!


If I helped...increase my Reputation by clicking here.
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Martin
May 24, 2006, 9:07am Report to Moderator Report to Moderator

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Just doing the mod now so it will go back to standard while I test it.



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Justin
May 24, 2006, 9:22am Report to Moderator Report to Moderator

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That won't work either.

The purpose of the verification codes are so computers can't easily enter in the data.  The way it is now they could just pass the "random" value to the post script ...

Look, here's how the image verification works ...

When you go to the page a random series of numbers and letters are generated, and then added to an image.  That image is then saved as the hash value of that random number and letter sequence.  A user must enter the correct sequence and the value of that image.  The  users sequence will be verified by the image with that name AND with a valid verification ID (the hash) embedded in the registration page itself.  The value needed IS NOT in clear text ANYWHERE.  After this is verified, the user is accepted.  If not, then the image is deleted and a new one is created.  It would take a LOT of work for a computer to randomize and get that hash.  Possible?  Yes.  It would take a ton of time and effort though ... and that's just for one user.  If the value is wrong, the image is deleted.  


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Martin
May 24, 2006, 1:22pm Report to Moderator Report to Moderator

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I'm not giving up on this  

As it is now:

A random number is generated and displayed for input
This number is then encrypted and passed to a hidden form
The user then inputs the verification code
This is then encrypted and passed to a hidden form
Finally, the 2 encrypted files are then compared, if they match the post is made
If they don't match then an error message will appear
Once posted the form is cleared so no random number and no encrypted files

I'm going to try another way not sure if it will work so won't say anything yet  



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Justin
May 24, 2006, 1:43pm Report to Moderator Report to Moderator

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You're not getting it.

A computer can read the page and then enter the value.  If it's clear text, it's not going to work.


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Martin
May 25, 2006, 6:25am Report to Moderator Report to Moderator

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Is this better??

http://www.opportunitynowhere.co.uk/cgi-bin/forum/Blah.pl?

Need to do some bits for the Admin Center still, ability to turn off and on etc



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Justin
May 25, 2006, 6:28am Report to Moderator Report to Moderator

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The images do not load.


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Apollo
May 25, 2006, 6:46am Report to Moderator Report to Moderator

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Hmmm......

For those not getting it, try searching for 'scraping', or start here:

http://en.wikipedia.org/wiki/Screen_scraping

and follow the links.
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Martin
May 25, 2006, 7:55am Report to Moderator Report to Moderator

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Quoted from Justin
The images do not load.


My fault, I have a an extra path statement in Settings.pl, not configured to keep it yet so when I done a save the path to the images went.

Loading fine for me now.



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Justin
May 25, 2006, 8:19am Report to Moderator Report to Moderator

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Still not loading.

And when going to:

http://www.opportunitynowhere.co.uk/cgi-bin/forum/captcha.cgi?i=888

I get the URL printed back out to me??


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Martin
May 25, 2006, 8:21am Report to Moderator Report to Moderator

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I was working on it  

I get the letter N when I go to:

http://www.opportunitynowhere.co.uk/cgi-bin/forum/captcha.cgi?i=888



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Justin
May 25, 2006, 8:53am Report to Moderator Report to Moderator

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Don't think so ...

A computer can find all the letters by going through all the numbers and getting the letter.  It may would work, just doubt it.  Also, how are you verifying it?  The hidden text is blank?


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Technical support is always free.

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"But you, O Lord, are a compassionate and gracious God, slow to anger, abounding in love and faithfulness." — Psalm 86:15 NIV

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Martin
May 25, 2006, 9:16am Report to Moderator Report to Moderator

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This is a pukka captcha script that I have modified extensively.

It does exactly what you said it needed to do earlier.

It takes 6 random images from 25 jpg's, then makes them into one image which is then displayed.

This is then encrypted and sent to a log file.

my $security_key2=sha1_hex($secret_word)

After the user enters the letters this is then compared against the $ecret_word

A computer can find all the letters by going through all the numbers and getting the letter.  It may would work, just doubt it.

I doubt it as they are all jpg images and not actual letters.



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Justin
May 25, 2006, 9:23am Report to Moderator Report to Moderator

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Hmm ...

What you need to do is have the ?i=# be totally random.  That way if you call ?i=# twice it'll change the number/letter shown.  That should make it work ...


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Martin
May 25, 2006, 9:48am Report to Moderator Report to Moderator

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Hey, I'm just a beginer compared to you, not sure if I could acieve that but I have an idea that I will try.

At the moment the script calls rand_key.pl which I have attached.



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