Fri Jul 01, 2016 4:54 pm
Does your super secret PDF include any author or publisher information? Is there an email address for the author?
Because without being able to disclose the contents on here, nobody can help you. There must be some documentation of what the default password is set to. Lots of initially installed systems have well known id/password combinations like "pi/raspberry", "root/root" or "root/toor" and such like.
There are some ugly ways you can boot a Linux system with an unknown password to a root shell (which then lets you reset every password). There are some slightly less ugly ways by booting the system from a system with a known password, mounting the filesystem from the card with the unknown password and using a chroot to get access to it and reset the unknown passwords. There's even an desperately ugly way by copying a known password entry from /etc/shadow over the /etc/shadow file on the system with the unknown password.
But you may not have the skills to do that.
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