Question abut use of --cipher-algo AES & --openpgp

[David Shaw]

On Tue, Nov 07, 2006 at 09:04:35AM -0700, Henry Hertz Hobbit wrote:
> On Mon, 2006-11-06 at 14:02 -0500, David Shaw wrote:
> 
> > On Mon, Nov 06, 2006 at 07:39:07PM +0100, Johan Wevers wrote:
> > > Henry Hertz Hobbit wrote:
> > > 
> > > >*	3DES:           8C 0D 04  02 03 02
> > > >*	CAST5:          8C 0D 04  03 03 02
> > > >*	BLOWFISH:       8C 0D 04  04 03 02
> > > >*	AES:            8C 0D 04  07 03 02
> > > >*	AES192:         8C 0D 04  08 03 02
> > > >*	AES256:         8C 0D 04  09 03 02
> > > >*	TWOFISH:        8C 0D 04  0A 03 02
> > > 
> > > I guess IDEA is 8C 0D 04  01 03 02.
> > 
> > This method for identifying ciphers is not reliable. 
> > There are many ways for a file to be packed, and this
> > method will do the wrong thing for all but one of the
> > ways.
> 
> I am from Missouri today, and I am stubborn mule.  8^)
> 
> First, please remember that we are talking about only symmetrically
> enciphered files without email etc.  Just encrypting a file on the
> computer.  That was what the person was doing, and they were not
> using the --armor (-a) option.  You will of course NOT get the
> above first six bytes with the armor option since the very first
> character is not a valid ASCII text character.
> 
> Please specify at least one way (preferable to have two or three)
> where this is not the case for a symmetrically enciphered file
> that is written to the disk (not piped into email, etc.). I am
> not saying that you are wrong.  It is just that I have tried it
> quite a few ways and I always come up with the same first six bytes
> for any given cipher, including even some where GnuGP gives me
> messages like this

I've attached two files that will both give you the wrong answer using
the "first six bytes" methodology.

David
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?^kp???%?-?????jFF??L
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