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(A volume spans part of a hard disk drive, the whole drive or more than one drive.) When enabled, TPM and BitLocker can ensure the integrity of the trusted boot path (e.g. BIOS and boot sector), in order to prevent most offline physical attacks and boot sector malware.
Microsoft released BitLocker Countermeasures [3] defining protection schemes for Windows. For mobile devices that can be stolen and attackers gain permanent physical access (paragraph Attacker with skill and lengthy physical access) Microsoft advise the use of pre-boot authentication and to disable standby power management.
For Data at rest protection a computer or laptop is simply powered off. The disk now self-protects all the data on it. The data is safe because all of it, even the OS, is now encrypted, with a secure mode of AES, and locked from reading and writing. The drive requires an authentication code which can be as strong as 32 bytes (256 bits) to unlock.
Unlocking the bootloader allows installing and running unsigned code on a device, including user customized software. Operating outside the manufacturer specification might usually result in voiding any warranties and may make the device susceptible to data theft, as the integrity of the operating system (as intended by the manufacturer) can no longer be guaranteed. [1]
FREE CompuSec CE-Infosys 2002 Proprietary: Yes FreeOTFE: Sarah Dean 2004-10-10 [18] Open source: No GBDE: Poul-Henning Kamp: 2002-10-19 [19] BSD: No GELI: Pawel Jakub Dawidek 2005-04-11 [20] BSD: Yes GnuPG: Werner Koch: 1999-09-07 [21] GPL: Yes gocryptfs Jakob Unterwurzacher 2015-10-07 [22] MIT / X Consortium License: Yes Knox AgileBits 2010 ...
Some implementations such as BitLocker Drive Encryption can make use of hardware such as a Trusted Platform Module to ensure the integrity of the boot environment, and thereby frustrate attacks that target the boot loader by replacing it with a modified version. This ensures that authentication can take place in a controlled environment without ...
Volumes encrypted with Bitlocker can be mounted if a recovery key is available. Windows Recovery Environment can also be installed to a hard drive partition by OEMs, [28] and customized with additional tools such as a separate system recovery tool for restoring the computer back to its original state. [29]
To undo a lock (security device) Phone unlocking, the removal of a SIM lock on a mobile phone; iOS jailbreaking, removing the limitations imposed by Apple, Inc. on iOS devices; Rooting (Android), allowing users of Android devices to obtain root access within Android's subsystem (similar to iOS jailbreaking)