You're right, but as you note later on it's possible to use DES in a
way that results in an effective 40-bit key length.
I don't know what Checkpoint might be using, but one way is to use
IBM's CDMF (Commercial Data Masking Facility). CDMF shortens a 56-bit
DES key to a 40-bit equivalent key. The key contains 56 bits, but the
effective key length is 40 bits.
There are other ways of achieving a reduced effective key length.
RC4_40 under TLS, for example, is accomplished by taking 40 bits of
key material and running that through a key expansion algorithm to
generate a 128-bit key that nonetheless has an effective key length of
40 bits.
--Elgin
>>>>> In <[EMAIL PROTECTED]>
>>>>> Mikael Olsson <[EMAIL PROTECTED]> wrote:
> I might be speaking out of my arse here, but I have the distinct
> recollection that there is no such thing as 40 bit DES; the
> algorithm is firmly super-glued to the idea of keys of 56 bit length.
>
> Am I wrong?
-
[To unsubscribe, send mail to [EMAIL PROTECTED] with
"unsubscribe firewalls" in the body of the message.]
