[LINK] Stolen Laptop [was Re: Consumer computer security]

[Adam Todd]

At 02:04 AM 29/01/2007, Rick Welykochy wrote:
>Johann Kruse wrote:
>
>>On 29/01/07, Rick Welykochy <rick at praxis.com.au> wrote:
>>>Heh? AES encryption and decryption cost CPU cycles. Copying data from one
>>>AES encrypted file to another will be measureably slower than the equivalent
>>>non-enrypted copy. Microsoft would know this already. We Mac and Linux
>>>users know this. Even if the AES functions are performed on the chip,
>>>DMA to/from the chip will take extra time. Why the spin?
>>Personally I notice no difference in speed between two laptops of
>>pretty much identical specs, one with Bitlocker and one without.
>
>Try comparing duplicating a 1 GB file on an unencrypted volume and
>doing the same on a Bitlocker-encrypted volume. I would be interested
>in the CPU load for both operations.

Try copying a 48 Gig video file from one Apple to another Apple over a 1 
Gig Link with software and hardware encryption.