The topic comes up here from time to time, people ask for guides how to use GnuPG and the first steps IMHO should always be to use it for mail, because its the easiest and there are good guides. Here is one of these guides, with a nice inforgraphic.
Link to guide.
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fstatic.fsf.org%2Fnosvn%2Fenc-dev0%2Fimg%2Fen%2Ffull-infographic.png&t=665&c=bk-OKw2ZI7VGbA)
If you like it, consider a
donation to them. Yes the free software foundation accepts bitcoin and litecoin.