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Thursday, June 16, 2016

When you print important crypto stuff (private keys) make sure you use a proper font and don't leave traces on your printer's hard drive and your computer's hard drive

When printing your keys make sure you use a proper font (that don't have similar characters - like "I" and "l", zero and big O).

Also don't trust your printer - some printers have hard drives. And copy of all printed documents is saved on your hard drive (and then "erased" but it still revocable using "undelete" programs) - even in Linux.

You can use this trick to prevent copies of printed pages to be written on the computer's hard drive (this is NOT applicable for printer's hard drive):

mount -t tmpfs -o size=1G tmpfs /var/spool/cups
chmod 0710 /var/spool/cups
chown root:lp /var/spool/cups
mkdir /var/spool/cups/tmp
chmod 1770 /var/spool/cups/tmp
chown root:lp /var/spool/cups/tmp

Also you need encrypted home folder (/home/yourusername) to be safe.

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