I see, so it is possible to do encryption and decryption in any order. I see it as sort of like commutative property.
I'm not so "savvy" about the mechanisms of encryption and decryption at tis moment, is this property only applicable for the Blowfish algorithm or does it apply to only some symmetric ciphers?
Where can I find mo' information about this?
Thanks in advance,
Louis Lam
From: "Allan Latham" <alatham@xxxxxxxxxxxxxxxxx> Reply-To: ppdd@xxxxxxxxxxxxxxx To: "Louis Lam" <lsauchun@xxxxxxxxxxx> CC: <linux-crypto@xxxxxxxxxxxx>, <ppdd@xxxxxxxxxxxxxxx> Subject: [PPDD] Re: creation of working passphrase Date: Sat, 2 Dec 2000 17:38:33 +0100
Because the whole control block gets encrypted later with the master key.
By decrypting that part in advance of encrypting the whole block effectively
leaves it unencrypted (by the master key).
i.e. you can do the encrypt and decrypt in any order. Which function you call decrypt and which encrypt is your choice! The one simply undoes what the other did.
Best regards
Allan ----- Original Message ----- From: "Louis Lam" <lsauchun@xxxxxxxxxxx> To: <alatham@xxxxxxxxxxxxxxxxx> Cc: <linux-crypto@xxxxxxxxxxxx>; <ppdd@xxxxxxxxxxxxxxx> Sent: Friday, December 01, 2000 7:12 AM Subject: ppdd: creation of working passphrase
> Hi,
>
> This is a question for ppdd
>
> file=pass.c
> function=newpass
>
> In this function, during the creation of the working passphrase, I can see
> that the existing information in the "mkey" field of the control block is
> being encrypted with the Key that is derived from the Working Passphrase,
> but why is it decrypted with the Key derived from the master passphrase
> before writing back to the control block?
>
> Thanks in advance
>
> Louis Lam
>
____________________________________________________________________________
_________
> Get more from the Web. FREE MSN Explorer download :
http://explorer.msn.com
>
>
_____________________________________________________________________________________ Get more from the Web. FREE MSN Explorer download : http://explorer.msn.com
Linux-crypto: cryptography in and on the Linux system Archive: http://mail.nl.linux.org/linux-crypto/
