Secure beagleboard?


I have a project in my hands that will require some tight security about
the data it will contain (I.E. the data will be written encoded and I
don't want to make very hard to get it out raw or fake the
cliente/server conection. Think about it as a secure PDA or POS). I
normally would go for something like the Atmel's ZA9L1 but I wonder if
someone has ever done anything like that with a design similar to the
beagle board.