Bit locker

I have around 150 users using windows XP,We are planning to migrate to win7 and enable Bit locker  encryption on all computers,I need to know,
1, Will be performance of computer will go down if i enable bit locker encryption
2,Do user will have any problem accessing the network shares,eg : If one user make a change on a file from the shared folder,Can the other user who have access to the shared folder able to open the files without any problems.
3,If anybody using bitlocker in a network environment,please advise the necessary steps to follow before the migration.
Please advise.Thanks a million
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Joseph MoodyBlogger and wearer of all hats.Commented:
1. Technically yes. But you won't notice

2. Nope. Bitlocker is hardware only encryption. It does not interfere once the operating system is started

3. You will probably want to enable bitlocker during the imaging process. If you have the extra money - Microsoft Bitlocker Administration and Monitoring is very useful!
Jmoody10 answered your questions, but just to add some things you should consider or have in minde.

Remember to use Win7 Enterprise or Ultimate.

Should you use Bitlocker To Go? -> Make sure to inform the users before, and not after.

Where should you store the recovery key? In AD or let each user take care of it.

Will you use the TPM? (make seperate GPOs. One for TPM and one with out TPM)
dmgUAEAuthor Commented:
I would like to store key on the AD,What should i do to store the key on Ad?
Is it necessary TPM should be there for all computers using bit locker?
If a Bit locker enabled laptop user access network shareand any changes made,Will the data can be accessed by an another laptop  user on the network?
Please advise.
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Joseph MoodyBlogger and wearer of all hats.Commented:

No but it is recommended. If you don't have a TPM chip, you will need to do USB key. This is less secure as users will leave the usb key in the computer

Yes. Once a machine is in Windows, bitlocker doesn't have an effect.
Bitlocker will not encrypt files on a network share. If a user connect to a nettwork share from his Bitlocker enabled machine and make a change on a file. This file is not encrypted.

Bitlocker encrypt the local disk on the machine. Northing more. If you use Bitlocker To Go, you can enforce users to encrypt i.e. USB drives if they want write access to it.

Here are the links I used when I configured Bitlocker (it is alot of reading):

Best practices:

Best practices 2:

Step-by-step guide:

Group Policy:

Password recovery:
dmgUAEAuthor Commented:
Thanks,The above links are absolutely good and helpful,If you dont mind can you guide me how can i deploy bitlocker,both user laptop configurattion and group policy
Ouch, that would be one long post!

I would recomend you to configure a GPO (link above). I don't know your requirements or company policy, so I can't say tick that and don't tick that one, etc.

If you have a mixture of laptops and desktops and you only want BitLocker on the laptops, you can:

a) Move all laptops to an own OU and link the GPO to that OU.
b) Enable a WMI filter on the GPO to only apply to laptops.

Do all laptops have a TPM chip, and will you take adventage of it? (this can give you a PIN authentication before the OS is loaded, aka. two-factor authentication).

If you want to use the chip you'll have to initialize it and take ownership of it. See "Best practices 2" above.

In the GPO you'll also set if you want to use "BitLocker To Go". If you enable it, users can't write to i.e. USB flash drives/disks if they have not encrypted the USB unit. In the GPO you also set the password length to be used on USB disks/flash drives.

If you have MAC/Linux users, they will be unable to read a BitLocker encrypted drives. Legacy Win OS (Win XP) without Bitlocker, can read the drives aslong as they type the password set on the encrypted USB disk.

When the GPO and TPM chip is in place, users can enable Bitlocker and encrypt the disk (open Explorer, right click the C-drive and choose encrypt).

Since BitLocker should be configured to meet the company policy, I can't give you a direct guide on how to do it.
dmgUAEAuthor Commented:
When I try to setup advanced group policies for Bitlocker on server 2008, I notice below are missing:

- Operating System Drives
- Fixed Data Drives
- Removable Data Drives

Please advise.
Do you setup the GPO from a 2008 DC?

If you don't have 2008R2 DCs, you can do it from a Win7 machine to see if you spot the missing settings.
dmgUAEAuthor Commented:
I have a win 2008 server and in the server only i am missing following under Bitlocker,

- Operating System Drives
- Fixed Data Drives
- Removable Data Drives
To Enable DRA,If i go to windows setting---security settings---public key policies,i cannot see Bit locker there aswell.
Did you try from a Win7 machine? (You will have to use RSAT

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