[Johnythree]

Talk to your radio supplier, there are many encryption devices routinely used on VHF and UHF.

Of course encryption is not impossible on HF, just a bit more difficult.

Whatever, both commercial and military uses are using encryption on HF.

[lrvick]

Commercial and military use encryption with well known backdoors on HF, using bands only they are licensed to use with proprietary hardware.

https://www.wired.com/story/tetra-radio-encryption-backdoor/

This is why proprietary solutions are non-starters.

Civilians deserve real encryption they can control with provable privacy.