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change bitlocker encryption from 128 to 256

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  • change bitlocker encryption from 128 to 256

    Hi,

    We've already bitlockered a bunch of boxes with the default settings 128bit AES + Diffuser.

    I'm aware that you're able to set bitlocker encryption methods/strength via gpo.

    What would happen if i set a GPO specifying 256bit AES + Diffuser...? would the pc's automatically re-encrypt the drives to that level? or would it only effect newly bitlockered machines?

    Would i have to decrypt all the machines and then re-encrypt to get htem to go to 256Bit + diffuser?

    Any advice appreciated.

    Regards,

    Simon
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