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- 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.
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- 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.
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- 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.
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- 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.
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- ZDEL is part of the *ONETIME* shareware file security package. It is of
- course also fully functional as a stand-alone utility.
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- 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
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- Email: thegrendel@aol.com
-