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1995-04-26
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2KB
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45 lines
ZDEL
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ZDEL is a utility to securely delete files so that they cannot be retrieved,
nor can any information about their content can be recovered. It works by
overwriting every byte in the target file with '01', then overwriting every
byte with '255', thus resetting and setting almost all the bits of
information in the file. At this point, every byte in the target file is
overwritten by the character 'Z'. Finally, the file is deleted. Use of
UNDELETE-type utilities will restore a file that contains only the character
'Z' repeated for every byte of the original file. ZDEL works for both text
and binary files.
This is the second version of ZDEL. It is many times faster than the first
one. It takes about two seconds per 10KB to ZDEL a file, an acceptable wait.
The security of ZDEL has been enhanced from the previous version. The author
believes that a ZDELeted file cannot be recovered in its original form by
any means at all at the present level of technology. This includes the use
of supercomputers and magnetic analysis hardware.
Invoke ZDEL by typing: zdel filename, where filename is the name of the
target file to delete. Just typing zdel also allows entry of the target
file name later. The user is given a chance to change his (her) mind about
ZDELeting the file.
The source code for ZDEL, in C, is included for the edification of the
programming literate. Use and modification of the source is permissible
with the written permission of the author, who is liberal about such
matters.
ZDEL is part of the *ONETIME* shareware file security package. It is of
course also fully functional as a stand-alone utility.
Warning: a ZDELeted file *cannot* be recovered. Be absolutely certain that
you wish to "shred" the file before you use this utility.
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M\Cooper
3425 Chestnut Ridge Rd.
Grantsville, MD 21536-9801
--------------------------
Email: thegrendel@aol.com