One post tagged with "tls"

Here's a uncomfortable truth from the field: most industrial IoT deployments I've seen have at least one Modbus TCP device exposed without any authentication. No TLS. No access control. Just port 502, wide open, on a "segmented" network that's one misconfigured switch from the corporate LAN.

The excuse is always the same: "It's air-gapped." It never actually is.

This guide covers what securing industrial protocol communications looks like in practice — not the compliance checkbox version, but the engineering decisions that determine whether an attacker who lands on your OT network can read holding registers, inject false sensor data, or shut down a production line.