gnugp is a free utility that allows you to create and use pgp keys. These keys allow you to send files/mail to another person in 100% privacy. The keys are not able to be hacked.
pidgin's otr uses this at the backend. You may have heard of a windows tool called cryptophane which is a gui frontend for gnupg
Here's my (silent) video guide.
edit: Is there any way to make the embedded video larger?
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