Tin Hat is a Linux distribution derived from hardened Gentoo which aims to provide a very secure, stable and fast Desktop environment that lives purely in RAM. Tin Hat boots from CD, or optionally a pen drive, but it is not a LiveCD. It does not mount any file system from CD via unionfs or otherwise. Tin Hat was conceived as a challenge to the old mantra that physical access to a system means full access to the data. This is certainly true in the case of unencrypted file systems, and at least potentially true in the case of encrypted. Rather, Tin Hat aims towards the ideal of guaranteeing zero information loss should the attacker physically acquire the box either the adversary is faced with no file system to even begin cracking, or if any non-ephemeral memory is found, the adversary should not be able to tell if he is looking at encrypted data or random noise.