1994-06-22 - Re: your mail

Header Data

From: Phil Karn <karn@qualcomm.com>
To: ravage@bga.com
Message Hash: dc2feb0d7b8a7ed6dd3d7f49af90d9faa817611f501c1ad64a10f782932288e7
Message ID: <199406220214.TAA00451@servo.qualcomm.com>
Reply To: <199406191451.JAA01206@zoom.bga.com>
UTC Datetime: 1994-06-22 02:14:38 UTC
Raw Date: Tue, 21 Jun 94 19:14:38 PDT

Raw message

From: Phil Karn <karn@qualcomm.com>
Date: Tue, 21 Jun 94 19:14:38 PDT
To: ravage@bga.com
Subject: Re: your mail
In-Reply-To: <199406191451.JAA01206@zoom.bga.com>
Message-ID: <199406220214.TAA00451@servo.qualcomm.com>
MIME-Version: 1.0
Content-Type: text/plain


>> Hmm.  And if an attacker discovers you're using this method, and
>> decides to send out a signal on the same frequency?  You might find
>> your "random" numbers are suddenly all zeros...

>Band hop. Build a variable modulo counter and use its output to reset its 
>modulo and hop the band around pseudo-randomly. Unless they know or stumble
>on the particular design you are using it will be very difficult to track.

An even better idea: disconnect the antenna. Most of the noise comes
from the front end amplifier, not the galactic and cosmic background,
at least in your average consumer grade receiver. And this is a quantum
process that someone else definitely can't predict or copy.

Phil

Thread

• Return to June 1994

• Return to “Jef Poskanzer <jef@ee.lbl.gov>”
• Return to “Jim choate <ravage@bga.com>”
• Return to “khijol!erc (Ed Carp [Sysadmin])”
• Return to ““Perry E. Metzger” <perry@imsi.com>”

• Return to “Phil Karn <karn@qualcomm.com>”

• 1994-06-18 (Sat, 18 Jun 94 16:13:05 PDT) - No Subject - Jef Poskanzer <jef@ee.lbl.gov>
  • 1994-06-19 (Sun, 19 Jun 94 07:51:41 PDT) - Re: your mail - Jim choate <ravage@bga.com>
    • 1994-06-22 (Tue, 21 Jun 94 19:14:38 PDT) - Re: your mail - Phil Karn <karn@qualcomm.com>
      • 1994-06-22 (Wed, 22 Jun 94 05:40:59 PDT) - Re: your mail - khijol!erc (Ed Carp [Sysadmin])
        • 1994-06-22 (Wed, 22 Jun 94 11:13:23 PDT) - Re: your mail - Jim choate <ravage@bga.com>
          • 1994-06-23 (Thu, 23 Jun 94 15:15:39 PDT) - Re: your mail - Phil Karn <karn@qualcomm.com>
      • 1994-06-22 (Wed, 22 Jun 94 05:50:00 PDT) - Re: your mail - “Perry E. Metzger” <perry@imsi.com>