From: Loren James Rittle <rittle@comm.mot.com>
Date: Tue, 12 Mar 1996 18:59:58 +0800
To: cypherpunks@toad.com
Subject: Re: FCC & Internet phones
In-Reply-To: <199603100507.AAA02942@homeport.org>
Message-ID: <9603120137.AA17060@supra.comm.mot.com>
MIME-Version: 1.0
Content-Type: text/plain


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>From: Adam Shostack <adam@lighthouse.homeport.org>
>Date: Sun, 10 Mar 1996 00:07:20 -0500 (EST)

>Presumably, the signal has a number of charictaristics.  Some of them
>have a central switchboard, where preople go to set up calls.

Hum, I would set-up the system to `dial direct'.  Maybe I could
give you this one, for systems that allow random-chat modes.

>Most
>presumably use a mix of a UDP data connection and tcp for control
>functions.

OK, everything after the IP header is encrypted.  I don't even know
which protocol is in use.

>They all consist of high volume, long duration connections
>(or data flows in the case of UDP.)  Many probably use a standardized
>destination port.

OK, everything after the IP header is encrypted.  I don't know
which port is in use.

>They might use the urgent pointer to force data up
>the stack quickly.

OK, everything after the IP header is encrypted.  I don't know
which protocol options are in use.

>	In short, yes the data streams can be easily found, if one can
>tap and grep a T3 in real time.

In short, assuming IPSEC, the data stream cannot be easily found.
Slightly different assumptions led to a radically different outcome.

Regards,
Loren
- -- 
Loren J. Rittle (rittle@comm.mot.com)	PGP KeyIDs: 1024/B98B3249 2048/ADCE34A5
Systems Technology Research (IL02/2240)	FP1024:6810D8AB3029874DD7065BC52067EAFD
Motorola, Inc.				FP2048:FDC0292446937F2A240BC07D42763672
(708) 576-7794				Call for verification of fingerprints.

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