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self decrypting files
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The recipient double left clicks on the self decrypting file
seen as an attachment to the e-mail you sent. A dialog box will open (see below) allowing
the recipient to choose where to save the decrypted file. An good place to save the file
would be the users "desktop" because it will be easy to find it once decrypted.
The recipient enters the password, clicks the "GO!" button and the file is decrypted.
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TIP: The recipient of the self decrypting file can simply "copy" the password from
the first e-mail you sent them containing the password and "paste" it into the Cryptainer
LE password box. What do I mean by "copy" and "paste"? Here are some
good examples to
help you understand and use this basic, but useful concept.
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NOTE: In computer terminology the self decrypting file/package that is
created by Cryptainer is referred to as an "executable" file. An "executable" file can often be
recognized by the 3 letter extension .exe after the name of the file (example: setup.exe).
The 3 letter extension is used by some computer operating systems to identify the
type of file and the associated program that uses/opens the file. Some computer viruses
are packaged as executable files. It is possible that your self decrypting file
may be detected as a virus by some antivirus products. If it is detected as a
virus it may be stripped from the e-mail and/or isolated/quarantined. This is an
example (below) of what a recipient might see if your self decrypting file is intercepted
and stripped from the e-mail you send.
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Whether you experience this issue will depend on the antivirus software the recipient
is using and how it is configured. You may experience this same issue with
self decrypting files created with similar encryption products of other companies.
Some e-mail clients/programs may also block access to self decrypting files with .exe
extensions. In it's default configuration Microsoft's Outlook (version 6) will limit
access to files packaged as an executable (.exe extension).
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To view or modify how Outlook Express (ver. 6) treats attachments click:
- Tools (top center of the menu bar)
- Options...
- "Security" tab
- The checkbox next to "Do not allow attachments to be saved or opened
that could potentially be a virus".
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When you retrieve/receive e-mail your computer and e-mail client (example: Outlook Express)
connects to a computer called an e-mail server. An e-mail servers main job is to retrieve,
store and send e-mail for its customers/clients (that's you). An e-mail server can be
configured to filter the e-mail that it sends and receives. Depending on it's configuration
it may block any file with the .exe extension from being sent or received. As I mentioned
earlier in this article viruses and other types of malware/spyware
are often packaged as an executable (.exe extension) file. Filtering at the e-mail server is
used to reduce the possibility that e-mail can be used to spread these types of viruses and
nuisances.
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A potential way to work around these issues may be to simply rename your encrypted
file adding a different extension (example: visanumb.exe to visanumb.txt). This
may allow it to bypass the recipient's antivirus software and the protection offered
by some e-mail clients. The recipient would then rename the file to it's original
.exe form before they open and view the self decrypting file. I suggest you verify
the recipient has received your self decrypting file and was able to decrypt and
view it. Cypherix and Cryptainer LE offer an alternative to using a self
encrypting file. The alternative eliminates some of the problems/issues of the
self decrypting files packaged as an executable (.exe extension). See the
next page for more information ...
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