If your running in a non ham band, likely the easiest method for encryption would be to run gnupg. Turns it into text that can be sent, but it's secure.
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On Mon, Jun 5, 2023 at 04:50 PM, det wrote:
We have DoD customers working with partner countries .. where they want VarAC , VARA HF messaging but with at least AES-256 encryption
Tell them to go and buy a Dragon modem from SCS and use Pactor with AES-256
73 Dave