If you don't have the ability to boot something like a DVD/CD or USB key,
try john the ripper?

Save the encrypted string to a test file and run it through john the ripper
running on your system:

Ubuntu:

# apt-get install john

Centos/RH/Fedora:

# yum install john

Example use:

# john -single crackme.txt

References:

http://www.openwall.com/john/doc/

http://www.google.com/url?sa=t&source=video&cd=1&ved=0CDIQtwIwAA&url=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D3YyscD_tADk&rct=j&q=john%20the%20ripper&tbm=vid&ei=t3ofTsXRNqTv0gHB2bmYAw&usg=AFQjCNE8vdlkxhwQ15zCuBePI9Y9qk3mAQ&cad=rja

http://www.osix.net/modules/article/?id=455


On Thu, Jul 14, 2011 at 11:19 AM, Sam Kreimeyer <skreimey@gmail.com> wrote:

> Hello Mark,
>
> Have you tried using Kon-Boot? It's a bootable image that edits the kernel
> to bypass the password prompt.
>
>
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