Disk encryption wouldn't defeat an attacker that had access to your keys (either by compromising a running system or through a cold-boot attack[1]). If the keys

Disk encryption wouldn't defeat an attacker that had access to your keys (either by compromising a running system or through a cold-boot attack[1]). If the keys are available, the contents of the disk are accessible. Overwriting deleted files would still have value in these cases. [1] https://jhalderm.com/pub/papers/coldboot-sec08.pdf https://jhalderm.com/pub/papers/coldboot-sec08.pdf