Path: utzoo!yunexus!ists!jarvis.csri.toronto.edu!mailrus!shadooby!samsung!usc!apple!vsi1!lmb
From: lmb@vicom.com (Larry Blair)
Newsgroups: news.software.b
Subject: Re: Anyone interested in end-to-end checksums in news?
Message-ID: <1989Nov16.191457.13754@vicom.com>
Date: 16 Nov 89 19:14:57 GMT
Article-I.D.: vicom.1989Nov16.191457.13754
References: <14594@well.UUCP>
Reply-To: lmb@vicom.COM (Larry Blair)
Organization: Vicom Systems Inc., Fremont, CA
Lines: 18

In article <14594@well.UUCP> Jef Poskanzer <jef@well.sf.ca.us> writes:
=Seems like we could add an end-to-end checksum to netnews articles in
=an upward compatible fashion.  Add a new header field, "Checksum: ",
=based on the entire article except the Path: and Checksum: headers.
=Modify the news software to add the checksum to locally-posted
=articles, and check it if present on articles from elsewhere.

I brought up this issue a while back and was soundly thrashed.  Actually,
a checksum is not the answer.  What is needed is a CRC.

My main interest, at the time, was to try to stop the bogus Message-ID's
that were causing problems.  I found that there are a large number of
munged articles circulating on Usenet.

Obviously, there is the problem that either the Path: line has to be ignored
or the CRC will be to be recalculated with every hop.
-- 
Larry Blair   ames!vsi1!lmb   lmb@vicom.com