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- Xref: sparky comp.dcom.modems:19837 alt.security:5349
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- From: davidsen@ariel.crd.GE.COM (william E Davidsen)
- Newsgroups: comp.dcom.modems,alt.security
- Subject: Re: Caller ID products?
- Message-ID: <1993Jan22.163947.18768@crd.ge.com>
- Date: 22 Jan 93 16:39:47 GMT
- References: <C0wu1q.GK0@wsrcc.com> <1993Jan18.172024.20690@ssc.com> <1993Jan19.160818.8276@crd.ge.com> <1993Jan20.172626.11028@bernina.ethz.ch> <1993Jan21.173344.4911@crd.ge.com> <C18s8F.1qI@wsrcc.com>
- Sender: usenet@crd.ge.com (Required for NNTP)
- Reply-To: davidsen@crd.ge.com (bill davidsen)
- Organization: GE Corporate R&D Center, Schenectady NY
- Lines: 32
- Nntp-Posting-Host: ariel.crd.ge.com
-
- In article <C18s8F.1qI@wsrcc.com>, wolfgang@wsrcc.com (Wolfgang S. Rupprecht) writes:
-
- | They already have the number. There is no added info needed. Its the
- | same one that they just called. They just have to call back. The
- | added password is a benefit however. One can get the added password
- | without the dial-back baggage.
-
- Sorry, not correct. You need the info that (a) there is such a thing
- as a dial back modem (not universal), (b) the modem in question is a
- dialback (since a wrong password also results in a disconnect, also),
- and (c) the dialback delay to use for a recall.
-
- Also, a really fast dialback will start dialing (and busy the line)
- faster than the caller can get back in, unless a 2nd line is used by the
- caller. So additional info *is* needed, as possibly additional hardware
- as well.
-
- Just because expert system crackers all know about dialback, does not
- imply that all unauthorized users would ahve the information.
-
- And of course hunting for a random dialback time is likely to result
- in a nice trace of calls from a single number, which the telco probably
- could produce if motivated by a court order...
-
- I stand by my statement that every added level of difficulty improves
- security, and that you need to evaluate cost benefit. Since my Telebits
- have this feature I turn it on, and eliminate a group of less competent
- pests.
-
- --
- bill davidsen, GE Corp. R&D Center; Box 8; Schenectady NY 12345
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