encrypt - To protect private information by putting it into a form that can only be read by people who have the permission to do so.

Even though the Germans encrypted their messages with a complex Enigma code, Alan Turing and his team were able to figure it out.
paradox - A situation or idea that seems strange because it involves two aspects that are very different and seem to contradict each other, and both may be true.

It's a paradox that often it's the busiest people that have to most time to contribute to the needs of others.