Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!unmvax!tut.cis.ohio-state.edu!ucbvax!NIEHS.BITNET!ALBRO From: ALBRO@NIEHS.BITNET Newsgroups: comp.sys.apple Subject: RE: viruses and checksums Message-ID: <8903081732.aa22924@SMOKE.BRL.MIL> Date: 8 Mar 89 22:29:00 GMT Sender: usenet@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 5 I was under the impression that, in contrast to a checksum, which would give the same number regardless of the order of the bytes in a set, a CRC would come out differently if you had the same bytes in a different order. If that is the case, introducing new code into a file (even with a separate checksum of zero) would always be detected by a CRC. Is this right?