Re: DES doubts. why we use 56 bit key when ony 48 bits are used?
- From: "Douglas A. Gwyn" <DAGwyn@xxxxxxxx>
- Date: Thu, 29 Dec 2005 20:24:28 GMT
tomstdenis@xxxxxxxxx wrote:
> I don't quite get the question. What first and last permutations are
> you talking about?
DES encryption includes an initial (unkeyed) permutation.
The reason it is ignored in most DES analyses is that it
serves no security purpose; for example, using known
plaintext, one merely applies the known permutation and
uses the result as new "known plaintext" for DES-without-
the-permutation.
.
- Follow-Ups:
- Re: DES doubts. why we use 56 bit key when ony 48 bits are used?
- From: tomstdenis
- Re: DES doubts. why we use 56 bit key when ony 48 bits are used?
- References:
- DES doubts. why we use 56 bit key when ony 48 bits are used?
- From: fermisoft
- Re: DES doubts. why we use 56 bit key when ony 48 bits are used?
- From: tomstdenis
- Re: DES doubts. why we use 56 bit key when ony 48 bits are used?
- From: fermisoft
- Re: DES doubts. why we use 56 bit key when ony 48 bits are used?
- From: fermisoft
- Re: DES doubts. why we use 56 bit key when ony 48 bits are used?
- From: tomstdenis
- DES doubts. why we use 56 bit key when ony 48 bits are used?
- Prev by Date: Re: Password length and bit number of encryption algorithm?
- Next by Date: Re: DES doubts. why we use 56 bit key when ony 48 bits are used?
- Previous by thread: Re: DES doubts. why we use 56 bit key when ony 48 bits are used?
- Next by thread: Re: DES doubts. why we use 56 bit key when ony 48 bits are used?
- Index(es):
Relevant Pages
|
|
