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BitLocker
BitLocker (codenamed Cornerstone and formerly known as Secure Startup) is a full disk encryption feature included with select editions of Windows Vista and later. It is designed to protect data by providing encryption for entire volumes. By default it uses the AES encryption algorithm in cipher block chaining (CBC) mode with a 128-bit or 256-bit key, and also the Elephant diffuser (on Windows Vista and Windows 7) for additional disk encryption security not provided by AES. CBC is not used over the whole disk, only for each individual disk sector.
==History==
BitLocker originated as a part of Microsoft's Next-Generation Secure Computing Base architecture in 2004 as a feature tentatively codenamed "Cornerstone" and was designed to protect information on devices, particularly in the event that a device was lost or stolen; another feature, titled "Code Integrity Rooting," was designed to validate the integrity of Microsoft Windows boot and system files.〔 When used in conjunction with a compatible Trusted Platform Module (TPM), BitLocker can validate the integrity of boot and system files before decrypting a protected volume; an unsuccessful validation will prohibit access to a protected system.〔 BitLocker was briefly called Secure Startup prior to Windows Vista being released to manufacturing.〔〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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