On 13-09-28 02:40 PM, Henry Olders wrote:
Hello, all,
I want to run my raspi as a device for digital signage, the idea being to
display images fullscreen in a slideshow, without any user intervention. I've
got that running very well, using the raspbian distro, openbox window manager,
and either qiv or feh as the image viewer. The slideshow starts automatically
on boot, and runs forever, which is what I want.
Here is the problem: my client wants to prevent his images from being copied,
including being copied off of the SD card when physically removed from the
raspi. Encryption would accomplish this, so I'm looking at getting truecrypt
running on the raspi.
The difficulty I foresee is that if someone plugs a keyboard and mouse into the
raspi when it's running, they can access a terminal emulator which is already
logged in as user pi, and (I think) copy the image files out of the truecrypt
container into an unencrypted directory.
There may also be other security issues that people with more experience know
about.
Any ideas or suggestions much appreciated!
Henry
Use FBI instead which can run without anyone logged in. I use it for
slideshows on the pi. You can also use the video player, I forget the
name, but it is optimized for the pi. You don't need X at all, the
framebuffer is all you need.
Another option is to use a screen locker program that will show the
slideshow. ie: Xscreensaver and use the GLSlideshow option.
You could set permissions on the files so they are owned by root (or
another user) and only readable by root/user, then run the slideshow
program with sudo.
The problem with encrypting the files is that if a reboot happens
someone has to go type a password in.
The client is aware that they are displaying the images on a screen and
that anyone could record that screen? This is how I would steal them :)
Jeremy
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