home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!sun-barr!ames!agate!doc.ic.ac.uk!daresbury!mrccrc!warwick!slxsys!pipex!bnr.co.uk!bnrgate!nott!cunews!revcan!software.mitel.com!grayt
- From: grayt@Software.Mitel.COM (Tom Gray)
- Newsgroups: sci.crypt
- Subject: Re: A Copper Balloon
- Message-ID: <13575@grayt>
- Date: 19 Nov 92 18:20:51 GMT
- References: <BxKLDM.Mss@sneaky.lonestar.org> <1992Nov17.082637.1780@guvax.acc.georgetown.edu> <13570@grayt>
- Organization: Mitel. Kanata (Ontario). Canada.
- Lines: 35
-
- In article <1992Nov17.082637.1780@guvax.acc.georgetown.edu> denning@guvax.acc.georgetown.edu writes:
- >In article <BxKLDM.Mss@sneaky.lonestar.org>, gordon@sneaky.lonestar.org (Gordon Burditt) writes:
- >>>1. Caller activates call. All 3 parties generate a random x and
- >>>exchange their values y = a^x mod p for some a and p. All 3 parties
- >>>generate the key k in the style of DH but with 3 exponents instead
- >>>of 2.
- >>
- >> You're proposing enough telephone-company equipment to be involved in
- >> EVERY telephone call in progress at once. This is VERY expensive. If
- >
- >I'm not so sure. Switches are involved in every call right now.
- >Also, the majority of calls are unlikely to be encrypted and key
- >negotiation only takes place at the beginning of a call. But this
- >is a good point.
- >
-
- I'm afraid that this proposal reflects a naive view of the future of the
- communications network. How would such a proposal work with a virtual
- private network. How would it work over a private line with compressed
- traffic.
-
- Switches may be involved in every call but even today they are not involved
- in the setting up of every call.
-
- I could go on and on about this but I refer the reader to the manyarticles
- on the coming broadband network. In such networks bandwidth is reserved and
- protocols are negotiated end to end. The telco could not hope to be able
- to decipher the control message passing thrugh the bradband pipes.
-
- This is the concern that many have with the FDI digital telephony proposal.
- It will force the telecom industry to abandon promising future developments
- and in the case of this proposal standard industry technology which is
- curreltly widely deployed.
- --
- i.sinature
-