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- Xref: sparky uk.misc:3139 alt.conspiracy:14608
- Path: sparky!uunet!pipex!edcastle!warwick!cam-cl!pavo.csi.cam.ac.uk!rf
- From: rf@cl.cam.ac.uk (Robin Fairbairns)
- Newsgroups: uk.misc,alt.conspiracy
- Subject: Re: Camilla-gate
- Message-ID: <1993Jan25.103657.6071@infodev.cam.ac.uk>
- Date: 25 Jan 93 10:36:57 GMT
- References: <JIM.93Jan20163908@hunter.cs.strath.ac.uk> <1993Jan22.161524.20250@visionware.co.uk>
- Sender: news@infodev.cam.ac.uk (USENET news)
- Distribution: uk
- Organization: U of Cambridge Computer Lab, UK
- Lines: 31
- Nntp-Posting-Host: lelaps.cl.cam.ac.uk
-
- In article <1993Jan22.161524.20250@visionware.co.uk>, simon@visionware.co.uk (Simon Taylor) writes:
- |> [After quoting jim@cs.strath.ac.uk (Jim Reid) re. encryption of
- |> cell-phone calls]
- |>
- |> An interesting article in this weeks New Scientist actually makes
- |> this point during a discussion of a new encryption system
- |> being tested by Vodaphone. The system does not require a
- |> descrambler at the non-mobile end of the conversation since the
- |> scrambling and descrambling occurs just at the mobile and the
- |> base station. This is fine unless you make a call to another
- |> mobile which doesn't have the additional hardware required,
- |> in which case the call is transmitted in clear to and from the
- |> unequiped party. The additional cost was around #600 for the
- |> hardware and approx double the current call charges.
-
- Jim misses one important point of the NS article (which I only got
- round to over breakfast today) - the encryption appears to be
- bidrectional on any given link. Thus, if both ends of a two-mobile
- conversation have encryption, the conversation never appears on the
- air-waves in clear.
-
- What wasn't made clear was whether you would pay 4 times the cost if
- both ends were encrypted :-)
-
- |> This of course only prevents radio interception you can still
- |> intercept the call on the conventional telephone network :-(
-
- Which would, of course, overcome the GCHQ objection...
- --
- Robin (Keep Radio 3 != Classic FM) Fairbairns rf@cl.cam.ac.uk
- U of Cambridge Computer Lab, Pembroke St, Cambridge CB2 3QG, UK
-