The best way to ensure that your messages won’t be read by unwanted persons is to use encryption.
There may be many reasons why you are not using encryption. These three springs to mind:
- I have no information worth encrypting
- Only criminals hide information, and I am no criminal
- I lack the knowledge to use encryption
- I lack the tools to use encryption
The number one on this list is the most difficult to crack. If you don’t have an incentive to care for your messages, there is no need to go further down the list.