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- Newsgroups: comp.dcom.fax
- Path: sparky!uunet!pipex!warwick!doc.ic.ac.uk!cc.ic.ac.uk!imperial.ac.uk!vulture
- From: vulture@imperial.ac.uk (Thomas Sippel - Dau)
- Subject: Re: Fax with encryption?
- Message-ID: <1993Jan11.195959.19591@cc.ic.ac.uk>
- Sender: vulture@carrion.cc.ic.ac.uk (Thomas Sippel - Dau)
- Nntp-Posting-Host: cscgc
- Reply-To: cmaae47@imperial.ac.uk
- Organization: Imperial College of Science, Technology and Medicine
- References: <C0oMzE.LD6@newsserver.technet.sg>
- Date: Mon, 11 Jan 93 19:59:59 GMT
- Lines: 42
-
- 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 guess for a good encryption scheme, one would
- - have to scan in the page into internal memory, then enter a bignum as key,
- - all lines get encrypted on the fly while sending, and the receiving station
- - stores the encrypted pages in memory. Then a special function asks for the
- - bignum, decrypts and prints.
- -
- - Naturally that would need machines with some memory, but modern
- - faxmachines have quite some of it around, and with PC's and fax-modems
- - it would even be easier.
- -
- - Q1: Is there such a standard, or will it come? Will it contain a flag
- - in the header to tell the receiving machine that the fax in encrypted
- - and needs a key to print out?
-
- You can either encrypt the TEXT of the fax message, which the receiving
- fax machine will then print out as a faithful rendering of the garbage
- that comes out of the crypter.
-
- Or you can view the bitstream that represents the pixels on a sheet of
- paper as a message, and encrypt that. This would need a configurable lookup
- table in the receiving fax machine, and a keyword exchange mechanism,
- presumably a public key system. For this it would probably be easier
- to use a different modulation scheme - i.e. do the encryption at the
- physical/data link interface than at the transport or presentation
- layer.
-
- But since you would give up the unversality of fax for security, you
- might as well go the whole hog and use encrypted email to send your
- message - including scans of handwritten text and drawings. Probably
- much cheaper in the long run.
-
- Thomas
-
- --
- *** This is the operative statement, all previous statements are inoperative.
- * email: cmaae47 @ ic.ac.uk (Thomas Sippel - Dau) (uk.ac.ic on Janet)
- * voice: +44 71 589 5111 x4937 or 4934 (day), or +44 71 823 9497 (fax)
- * snail: Imperial College of Science, Technology and Medicine
- * The Center for Computing Services, Kensington SW7 2BX, Great Britain
-