[wmf]

For file encryption I've heard good things about age. I'm not sure what a good tool for file signing is. Email encryption/authentication is unsolvable.

[vlod]

For those that are interested in 'age' see previous hn thread [0]

That thread suggests (I'm not an expert) there seems to be a problem (with 'age') of overwriting files if you have the public key.

[0]: https://news.ycombinator.com/item?id=32980141