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- Viewing/opening file sent by secure method
February 27, 2007, 7:31 pm
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Suppose a document file (either a PDF file or TXT file) is sent by email
from one company to another using a secure method to encrypt the file
such as using WinZip with AES.
The ZIP file is received on a PC which is in a shared area and the PC
could be accessed overnight by other people.
QUESTION: How can the recipient open or view the file WITHOUT having to
later delete swap files, temp files, empty recycle bin, erase disk
areas, etc. The recipients in my case are non-tecnical and this
housekeeping will seem like a lot of new hoopla.
QUESTION: Is there an app which will decrypt a WinZip file but not
leave a trail of information?
QUESTION: Perhaps using a floppy or a CD to hold a Winzip-compatible
tool such as 7-Zip would work ??? Any suggestions?
QUESTIONS: Finally what about viewing the TXT or the PDF file that was
in the ZIP? Text and PDF viewers on the hard drive will probably create
temporary files also on the hard drive. Is there a floppy based PDF
viewer? Or a read-only PDF viewer which sits on a CD?
For ref: Notes on encryption safety (Winzip 10 help text).
EXTRACTING A FILE
If you extract an encrypted file and then delete the file, it may be
possible for someone to later "undelete" the file using file recovery
software or the Recycle Bin.
OPENING OR VIEWING A FILE
When you open or view a file from an archive (e.g., by double clicking
it), WinZip must extract the file to a TEMPORARY LOCATION so that the
associated program can open it. If you subsequently CLOSE WINZIP
without first closing the program that is using the file, WinZip may not
be able to delete the temporary copy of the file. Thereby leaving it on
disk in unencrypted form.
Furthermore, the ASSOCIATED PROGRAM may also make one or more BACKUP
COPIES of the decrypted file, and WinZip will not be able to delete
In addition, as described above, it may be possible for someone to later
RECOVER DELETED FILES using file recovery software or the Recycle Bin.
MEMORY AND PAGE SWAP FILES
After adding or extracting encrypted files, some or all of the
unencrypted file contents may remain in your computer's MEMORY or the
PAGE SWAP FILES on disk. A malicious user may be able to retrieve this
WinZip does not encrypt Zip file comments or, as described above,
information about encrypted files such as their names, dates, etc. Any
user with access to the Zip file can view this information without a
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