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

Pamela wrote:
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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Felix Tiede <tiede@pc-tiede.de> wrote:

In addition, the method of using a symmetric key to encrypt the data,
and the asymmetric key to encrypt the symmetric key, is when the data
is being transported across a live internet session...as in shttp,
SSL, sessions. Speed is a major factor in this type of communication.
In testing the time factors though, I found that (with Ghz processors)
the difference is not significant until you start moving large amounts
of data (in excess of 10Mb).

Regards,
Leroy

thank you both


Greetz


Pam


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