The NY Times has an article about compromising data on DRAMs via freezing them and reading the bits off. This would let someone read your encryption keys right off the chip.

It’s kind of funny — all of these crazy-complicated cryptographic schemes can be compromised by what amounts to breaking and entering. I’m sure someone will end up writing a paper entitled “Baby It’s Cold Outside : Zero-Knowledge Proofs With Freezing Verifiers.” Actually, that’s not a bad title…