Ham radio's purpose and band allocations are not designed to be a secure communication system. They're designed to be a place to experiment with radio, and as a

Ham radio's purpose and band allocations are not designed to be a secure communication system. They're designed to be a place to experiment with radio, and as a substantial side effect of that can also be a communication system. Adding encryption (and I'd also argue proprietary encodings, but that's another debate) defeats the purpose. Similar to how it can't be used for pecuniary interest. There are places you can use secure communications, for example in the ISM bands (like wifi) or you can license a chunk of frequency for your own use.