Power Management and Encryption

[feenberg-fCu/yNAGv6M at public.gmane.org (Daniel Feenberg)]

We have a desktop Fedora 12 box with encrypted disks. This satisfies a 
government agency worried about confidential data on the machine, but I 
would like the data to revert to encrypted after X minutes of idle time. 
The gnome-power-management GUI only provides for "sleeping" on idle and I 
can't find the appropriate configuration files to improve on that, such as 
by shutting down. I did test and found that one only needs input the Linux 
password to gain access to the disk after sleeping, although if sleeping 
could suitably unmount the encrypted disks, that would be fine also. (It 
might be hard since it is full disk encryption, including the OS).

An hour with Google didn't provide any information unrelated to batteries 
and UPSs - not even the name and location of the relevant configuration 
files (which are not mentioned in the "See also" of the relevant man 
pages).

Daniel Feenberg