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- Newsgroups: sci.crypt
- Path: sparky!uunet!spool.mu.edu!umn.edu!csus.edu!netcom.com!rcain
- From: rcain@netcom.com (Robert Cain)
- Subject: Re: Anti-spoofing protocol?
- Message-ID: <1993Jan5.054857.10718@netcom.com>
- Organization: Netcom - Online Communication Services (408 241-9760 guest)
- References: <1993Jan5.031805.26623@qualcomm.com>
- Date: Tue, 5 Jan 1993 05:48:57 GMT
- Lines: 40
-
- karn@servo.qualcomm.com (Phil Karn) writes:
- : In article <1993Jan4.215027.17258@netcom.com> rcain@netcom.com (Robert Cain) writes:
- : >This all assumes that you have a secure means of getting your public key
- : >to the other or an authenticated one. Both seem equivalent in the end
- : >to swapping a secret key to me. This makes me question the fundamentals
- : >of PK actually.
- :
- : Why do you say that? An authenticated channel is much easier to get
- : than an authenticated and secret channel. I can get pretty good
- : authentication right now by calling up somebody on the phone whose
- : voice I know well and exchanging MD5 hashes of whatever information we
- : want to authenticate (e.g., a public key). I could care less if
- : somebody eavesdrops this call, but I certainly *would* care if we were
- : exchanging secret DES keys instead.
- :
-
- Phil,
-
- Because even though it is much easier now that need not be true very
- long. DSP advancing as it is, I don't think that voice validation is a
- very good thing to count on even though it is the best I can come up
- with. It is far from spoof-proof, just non-trivial. I can envision a
- DSP based system that does a frequency domain transformation to convert
- the spectral content of one voice to another in real time. You are
- left of course with the nuances of voice that remain but I'll bet that
- if the spectral transformation were performed those nuances would be
- overlooked for the most part. Hell, just do a simple frequency shift
- of a voice and you probably will not recognize the speaker even if
- well known. Whether the converse is true, false recognition, I don't
- know because I have never heard it but I just have a feeling.
-
- Bob
- --
- Bob Cain rcain@netcom.com 408-358-2007
-
- 'The meek shall inherit the earth--the rest of us will move on..'
- Sameer Parekh
-
-
- PGP 1.0 or 2.0 public key available on request.
-