[41385] in Cypherpunks
Re: looking for anti-tamper software
daemon@ATHENA.MIT.EDU (Dr. Frederick B. Cohen)
Fri Oct 13 07:12:11 1995
From: fc@all.net (Dr. Frederick B. Cohen)
To: ecarp@netcom.com (Ed Carp)
Date: Fri, 13 Oct 1995 07:00:44 -0400 (EDT)
Cc: cypherpunks@toad.com
In-Reply-To: <199510130455.VAA29233@netcom6.netcom.com> from "Ed Carp" at Oct 12, 95 09:55:07 pm
>
> I used to have this C source that I could embed in a program, and it
> would tell me if the software had been tampered with at runtime. I've
> lost/mislaid/whatever the source, and I was wondering if anyone had anything
> that would do the same thing. As I recall, it calculated a simple CRC and
> embedded it into the .EXE file (it was written for MS-DOS).
>
> It doesn't need to be cryptographically secure - I just need to check to see
> if the executable has been corrupted. I've leafed through alt.sources and
> comp.sources.*.
You are aware that there is a generic attack against all such defenses -
aren't you? It has been published for 7+ years. For details see:
A Short Course on Computer Viruses - Wiley and Sons - 94
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