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- Xref: sparky comp.dcom.modems:19985 alt.security:5366
- Path: sparky!uunet!math.fu-berlin.de!unidui!flyer!flatlin!smurf.sub.org!news
- From: urlichs@smurf.sub.org (Matthias Urlichs)
- Newsgroups: comp.dcom.modems,alt.security
- Subject: Re: Caller ID products?
- Date: 22 Jan 1993 17:57:59 +0100
- Organization: University of Karlsruhe, FRG
- Lines: 29
- Message-ID: <1jp92nINN5lp@smurf.sub.org>
- References: <1993Jan18.172024.20690@ssc.com> <1993Jan19.160818.8276@crd.ge.com> <1993Jan20.172626.11028@bernina.ethz.ch>
-
- In comp.dcom.modems, article <1993Jan20.172626.11028@bernina.ethz.ch>,
- waldvoge@nessie.cs.id.ethz.ch (Marcel Waldvogel) writes:
- > In article <1993Jan19.160818.8276@crd.ge.com> davidsen@crd.ge.com (bill davidsen) writes:
- > > The newer Telebit modems have some security options, too. From memory
- > >the modem security register looks like this:
- > > 0 - no security
- > > 1 - ask for password (from another TB modem)
- > > 2 - ask for password, hang up and dial back
- > > 3 - ask for password, hang up, dial back, ask for password.
- >
- > That's ok for most of us. But, dialling back on the same line as the
- > call came in isn't secure (at least not on analog lines, I don't know
- > about ISDN).
- >
- It's safe with ISDN. However, the modem is probably still sitting behind
- a device which fakes a phone line -- which makes this unsafe unless you
- can monitor the ISDN line for incoming calls.
-
- You really want either something which sits directly on ISDN and speaks
- 64 or 56 kBit/sec (if ISDN), or separate lines for dialin and dialout
- (if POTS). Ask your PBX manufacturer or your telco. ;-)
-
- --
- There is nothing to which men cling more tenaciously than the privileges
- of class.
- -- Leonard Sidney Woolf
- --
- Matthias Urlichs -- urlichs@smurf.sub.org -- urlichs@smurf.ira.uka.de /(o\
- Humboldtstrasse 7 -- 7500 Karlsruhe 1 -- Germany -- +49-721-9612521 \o)/
-