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- Newsgroups: comp.dcom.fax
- Path: sparky!uunet!mcsun!sunic!ugle.unit.no!humpty.edb.tih.no!lumina.edb.tih.no!ketil
- From: ketil@edb.tih.no (Ketil Albertsen,TIH)
- Subject: Re: Fax with encryption?
- Message-ID: <1993Jan11.135750.26014W@lumina.edb.tih.no>
- Sender: ketil@edb.tih.no (Ketil Albertsen,TIH)
- Organization: T I H / T I S I P
- References: <C0oMzE.LD6@newsserver.technet.sg>
- Posting-Front-End: Winix Conference v 92.05.15 1.20 (running under MS-Windows)
- Date: Mon, 11 Jan 1993 13:57:44 GMT
- Lines: 43
-
- In article <C0oMzE.LD6@newsserver.technet.sg>, mathias@solomon.technet.sg
- (Mathias Koerber) writes:
-
- >Having bought a Fax-Modem recently (OAFax 9648), I started wondering whether
- >it wouldn't be possible to encrypt faxes. Not only in Software but also
- >in standard Fax machines. [...]
-
- I suppose that could in principle be possible, but it would be an all-new
- protocol that wouldn't be understood by old faxes. Well, of course that new
- one could be an extended old one, but if we are to buy new fax machines
- anyway, we might as well reconsider the protocol.
-
- With ISDN coming, the "I" part ("Integrated") implies something about
- getting access to all services through one net. The telecomm administrations
- are at least claiming thaty they will build a lot of interworking functions
- (IWFs) into the net, for interworking with eg. G3Fax and even G2Fax. Any
- sort of (user level) encryption makes all sorts of interworking impossible -
- the IWF function must be able to decipher the data to convert them to another
- format. This of course applies to all sorts of interworking - eg. physical
- delivery on a fax machine of an X.400 message with an encrypted body part
- doesn't make much sense, either.
-
- I guess that any encryption would treat the scanned file as a whole, ignoring
- line breaks etc. So the exchange protocol couldn't be line or page oriented.
- You are then left with a file transfer protocol of sorts. I think that would
- be a good idea - use one of the existing protocols rather than make up a
- special one for fax alone. You could use Kermit with a 14.4K modem, and you
- might get the image across faster than by modem... (Yes, that is a pure
- software solution)
-
- If you use ISDN, and you have a PC performing NT2 (PBX) functions, you may
- of course encrypt *all* the data (sound, fax etc.) without the fax machine,
- or whatever, "knowing" it. The receiver decrypts in a similar way, and the
- fax machines won't know that the data has been encrypted along the way.
- This wouldn't interfere with a scan-line-based protocol, either. But I
- don't think you'll find any standard for this setup. (So noone would even
- know the *method* you are using, which makes eavesdropping even harder!)
-
- But then, for ordinary use, I think the telecommunication services are
- sufficiently safe for eavesdropping - if the Norwegian telecomm adm were
- ever caught in letting anyone bug the net, the entire thing would break up.
- Maybe I am naive, but I sort of trust them. People who want to steal my
- papers have much easier ways to do it than to bug my phone line.
-