What’s Trust Among Friends: Secure Connections & Man-in-the-Middle Attacks

This article explains, via a narrative example, how accepting self-signed TLS certificates can enable man-in-the-middle attacks, then outlines how PKI, digital signatures, and chains of trust mitigate this risk. It recommends obtaining trusted CA-signed certificates—highlighting Let’s Encrypt as a free, broadly trusted option—over self-signed certificates (with narrow internal exceptions), and encourages security practitioners to educate others and adopt proper certificate management.