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writes to hard drives, removing their contents and stopping software that can restore data, even data that s overwritten by other data Numerous tools can perform this secure disk wiping; for example, Microsoft provides the Cipher tool, which has the capability to securely obscure previous data on a disk by writing all 0s, then all 1s, and then a random sequence of numbers For maximum security, run the Cipher tool multiple times To use it, you format the disk rst and then run Cipher with the drive letter, as in the following example:
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Format <drive>: /fs:ntfs /v:wipeme /x Cipher /w:<drive>:\
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What about security for laptops You have likely heard a story about a top-secret laptop that was left in the front seat of a car and was stolen You can t control the facts that laptops will get stolen, and laptops will be left at security points at airports But you can protect the content of your laptop, using the same technology as for protecting servers: BitLocker
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Windows Vista Enterprise and Ultimate editions and Windows Server 2008 (including Server Core installations) provide BitLocker drive encryption, which is used to encrypt the entire system boot volume For Windows Server 2008 (and Vista with SP1 installed), data volumes can also be encrypted for of ine protection For Windows Vista, the technology is targeted at laptops; because the entire drive is encrypted and can be accessed only with the passkey, nothing on the drive will be accessible to a thief For Windows Server 2008, use BitLocker on any server that you cannot physically secure When a machine is running, however, BitLocker does not offer protection, so online protection technologies such as Encrypted File System and Rights Management should be employed When BitLocker is enabled, at machine boot time, a secret key is requested before the encrypted drive can be accessed This secret key can be stored on a Universal Serial Bus (USB) key and/or in the form of a PIN The drive is encrypted with a Full-Volume Encryption Key (FVEK), and without the key, nothing on the drive can be accessed Therefore, protecting the FVEK is vital, and this is why a Trusted Platform Module (TPM) chip on the motherboard can be used to provide security services On most
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computers, go into the BIOS to enable TPM The FVEK can be unlocked in and of four ways:
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TPM only, with no user input required USB only, which means the USB device must be connected for boot to succeed and useful for computers without TPM support TPM with a 4- to 20-digit PIN TPM with a USB key
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NOTE Why would you bother with the TPM-only mode with no user input or USB key required What protection does that offer The disks do not work unless they are in the server! If someone wants to steal data at a physical level, taking the disks out of the server is an easy way to bypass OS security; the thief can then install them as an additional drive in another computer, giving the most portability Because disks are much smaller than a server, someone will notice you walking out of a building with a server under your shirt If the disk doesn t have access to the TPM in the server, the disk is encrypted, and the data is unavailable, so the TPM-only option protects the disk from being removed from the server This can work the other way, too: If you have a motherboard failure and you replace the motherboard, you have lost the TPM, and you need to use the recovery key
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With Bitlocker Drive Encryption, because the entire volume is encrypted, a second partition is needed to store the system information This second partition contains the boot les needed for BitLocker to function and the FVEK in protected form It s always the S: drive, and it must be marked as active and should be at least 15GB For Windows Vista Ultimate and Enterprise, a utility is available to automatically set up the drive configuration (see http://supportmicrosoftcom/kb/930063) For Windows Server 2008, you currently need to con gure the environment manually BitLocker works on only simple disks and NTFS partitions The active partition also needs to contain the boot con guration database and the boot les and not the main bulk of the OS This is why when you install Windows Server, it is a good idea to create a 15GB partition at the start of the disk and make it active Then you can create additional partitions to
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