So what can you trust? The person calling you might be a simulated voice, crafted to sound like someone you know. The person texting/DMing/emailing you might be

So what can you trust? The person calling you might be a simulated voice, crafted to sound like someone you know. The person texting/DMing/emailing you might be an attacker pretended to be someone you know. You can put trust in things like PGP, but they're sparsely adopted and still leave a huge attack surface.