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From: BRAND@SUMEX-AIM.arpa (Tony Brand)
Newsgroups: net.micro
Subject: Trojan horses and PD software
Message-ID: <933@brl-smoke.ARPA>
Date: Fri, 16-May-86 23:48:40 EDT
Article-I.D.: brl-smok.933
Posted: Fri May 16 23:48:40 1986
Date-Received: Sun, 25-May-86 06:57:56 EDT
Sender: news@brl-smoke.ARPA
Lines: 11

A lot of CP/M software came with CRC codes so that one could check file
integrity after modem transfer. Also an old copy protection scheme was
to have a program do a CRC check on itself after being loaded.

If PD software developers included these 2 schemes as standards we could be a
little more secure that we were getting legitimate copies of these often
outstanding (e.g. ARC512) programs.

I guess we've forgotten about CRC checks now that modem comm
programs are better!
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