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1992-03-28
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File Killer™
Version 1.20 - 28 March 1992
Copyright (c) 1992 Stuart Coates
When your ST deletes a file from a disk only the directory entry is
removed and all of your data remains intact on the disk. This allows you
and other people to un-delete your erased files and view your precious
data. If you want to protect your data from prying eyes, use File
Killer™.
What is File Killer™..?
File Killer™ is a small utility that can be placed in the AUTO folder of
your boot disk that allows you to delete files forever.
How does File Killer™ work..?
File Killer™ erases files by overwriting them with completely random
data before deleting the file in the normal way. Even if you did try to
un-delete the removed file, all you would get is a file full of garbage.
File Killer™ uses a well proven random number generator known as
Linear Congruential Method which was developed by D. Lehmer in 1951 and
documented in a book called: 'Algorithms in C' by Robert Sedgewick.
To completely erase a file, you must hold down the Alternate key when
you delete the file. Your ST will beep once and the screen will flash
while the file is being deleted.
WARNING.. WHEN YOU HAVE ERASED A FILE USING FILE KILLER™, YOU WILL NOT
BE ABLE TO RECOVER IT, SO BE VERY CAREFUL.
File Killer™ was inspired by a brilliant program from DO NOT STAMP
SOFTWARE called Shredr Plus. Shredr allows you to permanently delete
files also, but has many extra options for those who take security
seriously. If you like the idea of File Killer™ then you'll love Shredr
Plus.
To get a copy of Shredr, send $10 shareware fee to:
Postal: Gordon Meyer
Do Not Stamp Software
PO Box 781
Park Ridge, IL 60068-0781
U.S.A.
Online: CIS: 72307,1502
GEnie: GRMEYER
Don't forget to mention where you heard about Shredr.
Compatibility / Technical details:
File Killer™ is a small program that uses a tiny amount of RAM, and detects
file deletions by re-directing the Gemdos (TRAP #1) vector. It has an
XBRA ID of 'FKIL', don't worry if your favourite virus checker complains
about an invalid vector as some viruses link into the same place. File
Killer™ should work on all versions of the ST, but will not work on the TT
or ST's that are fitted with non 68000 accelerator boards, like Gadget's
SST or TinyTurbo 030. When I can get my hands on a TT (or a 63030
board), I will produce a version that will function on this hardware.
Registration details:
File Killer™ is distributed as shareware, for details of how to
register and for distribution rights see the STSPA.DOC text
file.
The author can be contacted in the following ways:
By post: Stuart Coates
9 Links Road
Kibworth Beauchamp
Leicester LE8 0LD
England U.K.
email: CIS: 100010,2106
BIX: scoates
Bath BBS (0225-840060): Hitchhiker
DISCLAIMER: Although this program has been thoroughly tested, I cannot
guarantee that it is defect free. Therefore I accept no responsibility
for the loss or damage of software or hardware through the use of this
program.
Credits for File Killer™
All Design / Coding......................................Stuart Coates
Original Idea.............................................Gordon Meyer
Testing...................................................Teddystacker
Gordon Meyer
Mark Matts
File Killer™ was developed using the excellent DevpacST2 assembler from
HiSoft. This product is highly recommended to anyone who takes 68000
programming seriously.