Re: Why does EFS uses two ways of encryption?
From: Felix Tiede (tiede_at_pc-tiede.de)
Date: 08/31/04
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Date: Tue, 31 Aug 2004 15:30:11 +0200
Pamela wrote:
> Hi,
>
>
> EFS uses an asymetric encryption but it also uses an FEK which is symetric
> encryption.
> In fact the FEK is encrypted by the asymetric encryption.
>
> Wouldn't it be possible that the asymetric method is directly used to
> encrypt the file?
>
> thx
>
>
> Pamela
>
>
AFAIK asymmetric encryption/decryption is slower than the symmetric method.
Because of that many encryption systems use a temporary session key to
symmetrically encrypt data and then use the asymmetric key to encrypt the
session key.
So it *would* be possible to encrypt a file with an asymmetric method, but
it would cost more CPU time.
Greetings,
Felix
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