If you are worried about sending Personally Identifiable Information (PII) or other sensitive data but can't afford some fancy encryption software you have some options.
Windows users can use "Gpg4win"
This is for file and email encryption. Gpg4win (GNU Privacy Guard for Windows) is Free Software and can be installed with just a few mouse clicks. Very easy to configure and use.
Linux users can use GNU Privacy Guard.
Obviously you are required to do a little more to get this rolling but you know that.
sudo apt-get install gnupg.
References, information, and news on other software vendors.
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