From: doug@netcom5.netcom.com (Doug Merritt)
Date: Tue, 31 Aug 93 07:39:03 PDT
To: Marc Horowitz <bbyer@BIX.com
Subject: Re: Commercial PGP: Verifying Trustworthiness
In-Reply-To: <marc@Athena.MIT.EDU>
Message-ID: <9308311433.AA11758@netcom5.netcom.com>
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--- Forwarded mail from Marc Horowitz <marc@Athena.MIT.EDU>

>From owner-cypherpunks@toad.com Mon Aug 30 23:40:01 1993
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To: bbyer@BIX.com
Cc: honey@citi.umich.edu, cypherpunks@toad.com
Subject: Re: Commercial PGP: Verifying Trustworthiness 
In-Reply-To: Your message of Tue, 31 Aug 93 00:14:18 -0400.
             <9308310014.memo.72462@BIX.com> 
Date: Tue, 31 Aug 93 02:28:52 EDT
From: Marc Horowitz <marc@Athena.MIT.EDU>


Marc Horowitz <marc@Athena.MIT.EDU> said:
>> I dunno.  The early versions of UNIX had a back door in the login [...]
>I've let a lot of stupid comments go by, but I have to respond to this one.
>
>It is true that Dennis Ritchie (I believe, if not him, one of the
>other original UNIX authors) proposed such a login/compiler virus.
>But it wasn't in any early version of UNIX.

Stupid? Watch the flame bait...he merely overstated a touch. The back doors
weren't part of any of the full distributions, it's true, but they
were quite a bit more than proposals. Ken Thompson actually distributed
those back doors via a compiler update, warning of a security problem
and urging all sites to recompile. Most did, which inserted the back doors
into the programs. That's close enough to the original claim.

See the Ken Thompson & Dennis Ritchie Turing Award Lecture, which goes
into detail about this. The level of sneakiness involved was amazing.
Compilers are the ultimate security breach.
	Doug