Remotely decrypting a server
I have a tricky one here where i need to find a way to securely authenticate a decryption mechanism of some sort where the authentication is provided remotely without any user-interaction.
Right now i have a number of boxes that all inform a central server when they are online. When they do this an OpenVPN connection is set up between them and the server.
However, i have been given the task to ensure that the scripts involved in this process are encrypted by default. This requires some form of self-decryption, which to my mind kind of goes against the whole idea of encryption/authentication in the first place.
I need some way to leave decrypted the bare essentials required to boot a box and securely connect to the central server automatically. Then the server would automatically send a key/passphrase and the rest of the files on the box would then be decrypted on the fly.
If anyone knows of any software that provides this (maybe through VMs?) it would be greatly appreciated.
I should add hat i'm also open to the idea of self-encrypting hard disks, but what i've read about these in regards to Linux support has put me off the whole TCG model.