Use encryption tools for every message type
If you still want to use for example Whatsapp or Skype for your messages you can use external tools to encrypt or decrypt messages. It is not the easiest way to send secure messages because you have to copy and paste a lot but sometimes there is no other way to do so.
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Infoencrypt.com is a very simple webtool to encrypt and decrypt messages. You can encrypt by entering the text and a new password or decrypt by entering the encrypted text and your password.