Re: Rewarding Challenge AS/400

[leif@xxxxxxx]

There are TWO encrypted16-byte values.
I'm getting a bit tired keep saying this...

----- Original Message -----
From: Don <dr2@cssas400.com>
To: Douglas Handy <dhandy@isgroup.net>
Cc: <MIDRANGE-L@midrange.com>
Sent: Tuesday, September 21, 1999 8:53 PM
Subject: Re: Rewarding Challenge AS/400


>
>
> Last I recall the PW is kept in a 16byte field as the internal encryption
> routine returns a 8 byte parm...I'm pulling from a VERY tired memory right
> now and am at a clients so don't ahve my hacker manuals handy...:)
>
> As I recall, the stored/output field should be large enough to handle the
> proper bounded des macro/MI instruct output to maintain uniqueness...
>
> Don in DC
>
> ----------
>
> On Tue, 21 Sep 1999, Douglas Handy wrote:
>
> > Leif,
> >
> > >BTW, there is no extra security in having a password longer than seven
> > >characters. You can safely cut it to LXPQ94K and save yourself some
typing.
> >
> > Are you sure it is 7 characters not 8?
> >
> > The normal DES-56 uses 8 bytes for the key, but drops every 8th bit so
> > only uses 56 of the 64 bits.  However 7 of the 8 bits in the 8th byte
> > are used in the cryptokey (in normal DES-56), although I do not
> > pretend to know if the 400 uses the same implementation and/or if the
> > encryption key is other than the first 8 bytes of the password.
> >
> > ** Later **
> >
> > OK, I just ran a little test with user-id TEST and the following
> > passwords, then checked the encrypted password, and it seemed to
> > verify my assertion:
> >
> >  LXPQ94K       = D836DB87 D883E5A4
> >  LXPQ94K$     = 5CF3B56B 2922B4A2
> >  LXPQ94K$_   = 5CF3B56B 2922B4A2
> >  LXPQ94K$_Y = 5CF3B56B 2922B4A2
> >
> > Of course, other things in the profile change when the password is
> > over 8 bytes long.  But I agree the strength of the security does not
> > improve over 8 bytes (of which 56 bits are used).
> >
> > Doug
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