john.blakeney@f1701.n713.z3.fido.oz.au (John Blakeney) (05/22/91)
crd check is only effective way of looking for viral activity unless search strings are known for the viruses listed in letters. trhere is no known virus(to my knowledge which does not alter crc check. the only way to dodge this check would be to alter files so that there is no change in crc. there has been a rumour of a virus which was written in a command.com file and the alteration of the crc was only by one bit! even in this case the truncating of the command com files to accomodate the virus was unsuccessful in hiding it. There havew even been rumours ofscan being infected because another viral check found a string which resembled that of a known virus.(sorry about lousy typing!) - --- TMail v1.21j * Origin: Prophet BBS (3:713/1701)