Path: utzoo!attcan!uunet!mailrus!accuvax.nwu.edu!delta.eecs.nwu.edu!phil
From: phil@delta.eecs.nwu.edu (William LeFebvre)
Newsgroups: sci.space.shuttle
Subject: Re: Nasa Freq.
Message-ID: <3769@accuvax.nwu.edu>
Date: 12 Feb 90 15:47:09 GMT
References: <2214@ritcsh.cs.rit.edu> <339@mtndew.UUCP>
Sender: news@accuvax.nwu.edu
Reply-To: phil@delta.eecs.nwu.edu (William LeFebvre)
Organization: Northwestern U, Evanston IL, USA
Lines: 15

In article <339@mtndew.UUCP> friedl@mtndew.UUCP (Steve Friedl) writes:
>I assume that there are all kinds of data streams going to and
>from the Shuttle (and to other things like Voyager or Galileo).
>Does NASA ever get worried about electronic sabotage over these
>frequencies?  Is everything encrypted?

I can only answer for the shuttle.  Uplink is encrypted, downlink is
only encrypted if the mission is red (DOD).  This didn't used to be
the case (used to be that uplink was only encrypted for red missions),
but this was changed soon after, maybe even starting with, STS-26.

		William LeFebvre
		Department of Electrical Engineering and Computer Science
		Northwestern University
		<phil@eecs.nwu.edu>