Encrypt a file to prevent unwanted viewers?

Encrypt a file to prevent unwanted viewers?
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Encrypt a file to prevent unwanted viewers? josh.dylewski 07-18-2007
Posted by on July 18, 2007, 12:12 pm
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This is what I would like to do:

Send a file through email so only that person can read it. I want to
prevent him from sending it to anyone. For his eyes only.

Is there an encryption program that can do that? I don't want a
password or anything like that. I want the receiver to not have to do
anything, but make it so if he forwards the email to someone else they
are not able to read it.

The file that I am sending through email is .doc. I was think of
sending PDF's though.


Posted by Todd H. on July 18, 2007, 12:41 pm
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josh.dylewski@gmail.com writes:

> This is what I would like to do:
>
> Send a file through email so only that person can read it.

PGP or GPG will do that with public/private keys, if you can get that
person to learn how to use those, generate a pub/private key pair, and
send you his public key so you can encrypt the message with his public
key.

Only he, with his private key, could decrypt that message.

> I want to prevent him from sending it to anyone. For his eyes only.

Now you've got a challenge.

> Is there an encryption program that can do that? I don't want a
> password or anything like that. I want the receiver to not have to do
> anything, but make it so if he forwards the email to someone else they
> are not able to read it.


Some mail clients like Lotus Notes have a "prevent forwarding" feature
that you can flag on messages. You both need to be using notes
though, and the feature is circumventable.

> The file that I am sending through email is .doc. I was think of
> sending PDF's though.

I'm afraid short of having a face to face meeting and patting them
down for a hidden recorder or wire, I'm not sure you can achieve what
you seek in a fool proof way.

Best Regards,
--
Todd H.
http://www.toddh.net/

Posted by Bogwitch on July 18, 2007, 1:07 pm
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Todd H. wrote:
> josh.dylewski@gmail.com writes:
>
>> This is what I would like to do:
>>
>> Send a file through email so only that person can read it.

> I'm afraid short of having a face to face meeting and patting them
> down for a hidden recorder or wire, I'm not sure you can achieve what
> you seek in a fool proof way.


The best solution would be an administrative control such as a
non-disclosure agreement. There are no technical solutions that are
foolproof. Not that a non-disclosure agreement is foolproof but at least
you will have some form of redress.

Bogwitch.

Posted by on July 19, 2007, 8:26 am
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yeah, I do that now. I just want something so that they go, "Oh, he's
not joking" when they read that. If they get there IT guy on it and
unprotect it then that fine. I just want so form of protection so that
they can understand that I really don't want them to show it around.

> Todd H. wrote:
> > josh.dylew...@gmail.com writes:
>
> >> This is what I would like to do:
>
> >> Send a file through email so only that person can read it.
> > I'm afraid short of having a face to face meeting and patting them
> > down for a hidden recorder or wire, I'm not sure you can achieve what
> > you seek in a fool proof way.
>
> The best solution would be an administrative control such as a
> non-disclosure agreement. There are no technical solutions that are
> foolproof. Not that a non-disclosure agreement is foolproof but at least
> you will have some form of redress.
>
> Bogwitch.



Posted by on July 19, 2007, 8:17 am
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Haha, Thanks for the reply. I don't think that would work to well, I
should of explained this better. Basically what I do is send a
proposal to a customer and I want that proposal protected. I send
probably 50 a year to people I really don't know, and that I don't
want them to have to do anything other than open the document. They
should know that it is protected, but once (if) it leave there
computer then it wont open.

Make any sense?

It seems like it is possible, once the document is opened it ties with
that computers address and only opens for that computer. That way if
he forwards it the receiver will not be able to open it. Seems
possible to me but I really don't know too much about whats out there.


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