Re: [hylafax-users] Encrypted FAX

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

Steve Underwood wrote:
> Lee Howard wrote:
> > Steve Underwood wrote:
> > > Does anyone know how widely supported the encryption options in T.30 
> > > are supported?
> >
> > I assume that you refer to ITU T.30 Annexes G (HKM/HFX) and H (RSA) 
> > which are advertised in DIS bits 81 through 91 (excluding 88)...
> >
> > The answer is that they're not widely supported at all.  Every time 
> > I've ever surveyed for them over the past years I've not found any 
> > machines "in the wild" that supported these features.  For example, I 
> > just now surveyed DIS information from 12,328 different receiver 
> > destinations in one database that I have.  None of them indicated any 
> > ITU T.30 security/encryption support.
> >
> > I've heard of encryption being used in "proprietary" scenarios (i.e. 
> > between dedicated fax machines for various branches of the same 
> > business) and in particular in the banking industry... but I don't 
> > even know if they're using Annexes G or H or if they're using their 
> > own proprietary security measures.  (I tend to believe the latter... 
> > done via NSF/NSS.)
> >
> > And this is off-topic, but in fact the only bits I ever see supported 
> > beyond bit 80 are bits 97-98, and 105-111 - all of which are 
> > resolution features.
> Interesting. Something I saw a while ago indicated that a lot of the 
> big Japanese machines support encryption.

Admittedly the machines which I surveyed are all in the United States.

> Maybe people have so little interest (or maybe so little 
> understanding) that they never set up keys and things, and hence 
> encryption is not advertised in the DIS messages.

That's entirely possible.

> Don't you see things like the double-sided capability being set? A lot 
> of the high end machines are multi-functional office printers capable 
> of double-sided printing.

I've privately sent you the raw DIS survey list (it's just the FCF of 
each machine's DIS HDLC frame) for you to peruse.

> I guess the only other high numbered bits you might expect to see 
> would only be present when a T.38 capable machine is being used.
>
> You must have a pretty rich database of DIS messages there. :-)

Oh, well... :-)  I flush it from time to time, even, too.

Thanks,

Lee.


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