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Vorras Antibot
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Version
1.0
Vorras Antibot is an image generation program that
prevents automatic form submission by robots. If your
web site is being overwhelmed with spam, automatic
registrations, automatic forum or classified ad
submissions etc., Vorras Antibot can solve this
problem by introducing a picture in your HTML forms
that only a human can recognize.
How does it work?
Vorras Antibot generates a random sequence of
alphanumeric characters and a picture in PNG format
that shows this sequence. It returns the filename of
the picture and the sequence in encrypted (hashed)
format. The filename and encrypted sequence can then
be stored in your HTML form. The user who attempts to
fill out the form has to look at the picture and type
in the sequence he sees. When the form is submitted
the sequence the user typed in is encrypted as well
(hashed) and compared to the original sequence. If the
sequences match the user passes the test, else it is
necessary to re-try. See the Demo on our website to
get an idea of how this works.
Vorras Antibot uses pre-existing PNG files to form the
character sequence in PNG format. These files are
graphic files of alphanumeric characters in PNG
format, and are provided when you download Vorras
Antibot. If you want to change the existing PNG files
you can replace with your own as follows:
Use any graphics package to create png files for all
letters and numbers and name them as a.png, b.png,...,
0.png, 1.png, ...
Upload them on your server and place them in the data
subdirectory inside the Vorras Antibot directory.
Run the parseidat.py script. This will generate the
intermediate format files a.dat, b.dat etc. necessary
to run Vorras Antibot.
After you complete the steps above you can re-run
Vorras Antibot with your new graphic files. For more
information please also see the README file which
accompanies the Antibot software.
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