Cryptography is not categorically illegal on the ham bands, and in the case of satellite/remote operation, it's encouraged (possibly required?) that you have so

Cryptography is not categorically illegal on the ham bands, and in the case of satellite/remote operation, it's encouraged (possibly required?) that you have some secure mechanism of controlling your radio. In the general case, there is nothing illegal about sending a PGP-signed email over Winlink, for example. But the message itself must be in the clear. It's just about the fear of foreign spies obfuscating their messages and Red Scare fearmongering. Of course, in a world with Tor and $30 TracFones with unlimited data, this concern is totally ridiculous. But it is what it is, for now.