RadSec vs RADIUS: What’s the Difference?
This video breaks down the difference between RADIUS authentication and RadSec. While RADIUS refers to the full authentication process between a device, network infrastructure, and the RADIUS server, RadSec specifically secures the communication between the network infrastructure and the RADIUS server using encryption.
We explain how securing device-to-network communication depends on authentication protocols like EAP-TLS or PEAP-MSCHAPv2, whereas RadSec protects sensitive RADIUS attributes such as usernames, MAC addresses, VLAN mappings, and network segmentation details from being exposed. By encrypting this traffic with certificates over TLS, RadSec prevents attackers from gaining visibility into your network architecture.
The video also discusses scenarios where legacy network hardware may not support RadSec and how a RadSec proxy can bridge the gap—especially when organizations are sending authentication traffic to cloud RADIUS servers. If you’re evaluating secure 802.1X deployments, understanding the distinction between RADIUS and RadSec is key.