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    Bit-Locker Drive Encryption

    On windows 7 & server 2008

    ByM.HARRY JOSEPH

    http://en.wikipedia.org/wiki/File:BitLocker_icon.png

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    Bit-Locker Drive Encryption

    Developer(s) :Microsoft

    Operating system :

    Windows Vista,

    Windows Server 2008,

    Windows 7

    Type : Disk encryption software

    License : Included with Windows Server 2008 and selected

    editions of Windows Vista and Windows 7

    http://en.wikipedia.org/wiki/File:BitLocker_icon.png

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    What is BitLocker Drive Encryption?

    is a full disk encryption feature included with theUltimate and Enterprise editions of Microsoft'sWindows Vista and Windows 7 desktop operatingsystems, as well as the Windows Server 2008 and

    Windows Server 2008 R2 server platforms. It is designed to protect data by providing

    encryption for entire volumes.

    By default it uses the AES encryption algorithm inCBC mode with a 128 bit key, combined with theElephantdiffuser for additional disk encryptionspecific security not provided by AES.]

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    BitLocker

    is available only in the Enterprise and Ultimate editions of WindowsVista and Windows 7.

    Users of other versions of Windows that don't include BitLockercould use a 3rd party encryption program to satisfy the need for fulldrive encryption .

    In the RTM release of Windows Vista, only the operating systemvolume could be encrypted using the GUI and encrypting othervolumes required using WMI-based scripts included in WindowsVista in the %Windir%\System32 folder.

    With Windows Vista Service Pack 1 and Windows Server 2008,volumes other than the operating system volume can be BitLocker-protected using the graphical Control Panel applet as well.

    The latest version of Bitlocker, included in Windows 7 and WindowsServer 2008 R2, adds the ability to encrypt removable drives.

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    http://upload.wikimedia.org/wikipedia/commons/6/64/TPM_Asus.jpg

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    Internal components of a Trusted

    Platform Module

    http://upload.wikimedia.org/wikipedia/commons/0/0b/TPM_english.svg

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    Three authentication mechanisms :

    Transparent operation mode: This mode exploits thecapabilities of Trusted Platform Module (TPM) 1.2hardware to provide for a transparent user experiencethe user powers up and logs onto Windows as normal.

    The key used for the disk encryption is sealed (encrypted)

    by the TPM chip and will only be released to the OS loadercode if the early boot files appear to be unmodified.

    The pre-OS components of BitLocker achieve this byimplementing a Static Root of Trust Measurementamethodology specified by the Trusted Computing Group.

    This mode is vulnerable to a cold boot attack, as it allows apowered-down machine to be booted by an attacker.

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    User authentication mode: This mode requires that the userprovide some authentication to the pre-boot environment in theform of a pre-boot PIN. This mode is vulnerable to a bootkit attack.

    USB Key Mode: The user must insert a USB device that contains astartup key into the computer to be able to boot the protected OS.

    Note that this mode requires that the BIOS on the protectedmachine supports the reading of USB devices in the pre-OSenvironment. This mode is also vulnerable to a bootkit attack.

    Recovery password: A numerical key protector for recoverypurposes.

    Recovery key: An external key for recovery purposes.

    Certificate: Adds a certificate-based public key protector forrecovery purposes.

    Password: Adds a password key protector for a data volume.

    http://en.wikipedia.org/wiki/Personal_identification_numberhttp://en.wikipedia.org/wiki/Bootkithttp://en.wikipedia.org/wiki/Personal_identification_numberhttp://en.wikipedia.org/wiki/Bootkithttp://en.wikipedia.org/wiki/Bootkithttp://en.wikipedia.org/wiki/Personal_identification_number

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    The following permutations of the above

    authentication mechanisms are supported, all with an

    optional escrow (also known as a fair cryptosystem)

    recovery key:

    TPM only

    TPM + PINTPM + PIN + USB Key

    TPM + USB Key

    USB Key

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    Operation

    BitLocker Drive Encryption is a logical volumeencryption system.

    A volume may or may not be an entire drive,

    and can span one or more physical drives.Also, when enabled TPM/Bitlocker can ensure

    the integrity of the trusted boot path (e.g.

    BIOS, boot sector, etc.), in order to preventmost offline physical attacks, boot sectormalware, etc.


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