Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!think.com!hsdndev!cmcl2!adm!news
From: s2525090@techst02.technion.ac.il (Eran Davidov)
Newsgroups: comp.lang.pascal
Subject: Re: password program
Message-ID: <27060@adm.brl.mil>
Date: 30 May 91 12:57:11 GMT
Sender: news@adm.brl.mil
Lines: 11

there is a way to block someone from booting from a floppy, which I learned
while playing around with HARDWARE security cards.
they change the boot sectore (or partition) so that any dos not autorized
by them cannot read the hard disk. when a user boots with a password (which
is supplied to the ROM security program) the program puts in memory a filter
that will change the boot sector to what it should be if anyone tries to read it, and that will write the altered sector, if anyone tries to write.
that way if you reset the computer, you have to supply the password again.
I dont know wether this is applicable to a software security routine, since
the code in config.sys is read from the directory, thus there cannot be a filter
,but maybe if a pingpong like (the virus) boot sector method is used, it might
work.