From: karn@qualcomm.com (Phil Karn)
Date: Wed, 21 Apr 93 19:58:00 PDT
To: cypherpunks@toad.com (Good Guys)
Subject: Re: The Family Key
Message-ID: <9304220257.AA22606@servo>
MIME-Version: 1.0
Content-Type: text/plain


At 08:29 AM 4/21/93, Harry Shapiro wrote:
>Thus, the NSA will be able to maintain an active traffic pattern
>analysis of ALL communications sent via the Clipper chiped devices.
>
>I think in many ways that traffic watching can and does often reveal
>more information about someone than at time listening in to what
>is actually being said.

I think this is an extremely important point. The US precedents regarding
traffic analysis (e.g., telephone "pen registers") are very anti-privacy.
I would not be at all surprised to see decisions saying that law enforcement
could use the Chipper ID anyway they liked, without a warrant.

Phil