Researchers at Princeton have discovered that with a can of duster and a laptop, it takes only matter of minutes to crack most encryption software, including BitLocker, FileVault, dm-crypt and TrueCrypt. The weak link that makes this ridiculously simple hack possible is the DRAM chip. Here’s why: Any time your computer is on, that chip contains the key used to access encrypted data on your hard drive. Once that chip loses power, the bits stored on it are supposed to disappear immediately. But that’s not really what happens.