How I can Encrypt/Decrypt messages between 2 users

How I can Encrypt/Decrypt messages between 2 users (tow email address) only   they using outlook 2013 , so these messages be secret between them ?
if the messages delivered to someone else out of these tow not open and show as encrypted message ....
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Hani M .S. Al-habshiContributor as IT ExpertAsked:
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AlanConsultantCommented:
Hi,

Many options.  The simplest would be to create the message as a txt file, and zip it up using, say, 7-zip and AES-256 encryption.  Pre-share the key via some other means, and have the second user decrypt like that.

Lots of other options though - GPG for example.

Alan.

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Hani M .S. Al-habshiContributor as IT ExpertAuthor Commented:
Thank you , I need to that through outlook 2013
AlanConsultantCommented:
Yes - encrypted zip would work for any mail client at all (as long as you can attach files).

If you wanted to go with somethink like GPG then this is a good guide:

https://blog.jigsawpieces.me/2015/03/19/tutorial-how-to-setup-gpg4win-with-outlook-2013/


Alan.
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Dirk StraussSenior Full Stack DeveloperCommented:
Have a look at the following article: HOW TO ENCRYPT MESSAGES IN OUTLOOK 2013. Encryption is built into Outlook, which will protect the mail while it is being transmitted over the wire.
If however you want to encrypt the text so that it is visually obfuscated, have a look at a free tool called Encipher it. I think this could be a good solution to what you are trying to achieve.
Hani M .S. Al-habshiContributor as IT ExpertAuthor Commented:
as email not as attachment
AlanConsultantCommented:
GPG is not just attachments - it is the whole email.

Did you read the link I gave above?

Alan.
Hani M .S. Al-habshiContributor as IT ExpertAuthor Commented:
I got the Idea
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