"Defendants can't deny police an encryption key because of fears the data it unlocks will incriminate them, a British appeals court has ruled. The case marked an interesting challenge to the UK's Regulation of Investigatory Powers Act (RIPA), which in part compels someone served under the act to divulge an encryption key used to scramble data on a PC's hard drive. The appeals court heard a case in which two suspects refused to give up encryption keys, arguing that disclosure was incompatible with the privilege against self incrimination. In its ruling, the appeals court said an encryption key is no different than a physical key and exists separately from a person's will."