> 198. In the United Kingdom, it is a criminal offence under the Regulation of Investigatory Powers Act 2000 to refuse to hand over an encryption key when requi

> 198. In the United Kingdom, it is a criminal offence under the Regulation of Investigatory Powers Act 2000 to refuse to hand over an encryption key when required. Care must be taken, however, to ensure that suspects do not seek to evade the provision by utilizing several layers of encryption and multiple keys to protect different data sets. For example, a setting of TruCrypt, a common free encryption tool, allows a suspect to encrypt a hard drive and create two passwords: one for the “clean” drive and the other containing the incriminating material. This can be circumvented by ensuring that the forensic examination of the hard drive takes into consideration whether there is any “missing volume” of data. If they had actually installed TrueCrypt and created a hidden partition or read the documentation, they would see that the other partition lies about space usage to prevent its existence from being provable