User's Manual Fixed Dome Network Camera AXIS 225FD
 37 
AXIS 225FD - System Options
The authentication process
RADIUS
RADIUS (Remote Authentication Dial In User Service) is an AAA (Authentication, 
Authorization and Accounting) protocol for applications such as network access or IP 
mobility. It is intended to work in both local and roaming situations.
CA servers
In cryptography, a Certification Authority (CA) is an entity that provides signed digital 
certificates for use by other parties, and thus acts a trusted third party. 
There are many commercial CA’s that charge 
for their services. Institutions and 
governments may have their own CA, and there are free CA’s available. 
Protected network
Axis video device
Q: Certificate OK?
Certificate 
Authority (CA)
3
1
2
4
A: OK
RADIUS
server
Network
switch
Q: Certificate OK?
A: OK
Certificate
Certificate
1. A CA server provides the required signed certificates.
2. The Axis video device requests access to the protected network at the network switch. 
The switch forwards the video device’s CA certificate to the RADIUS server, which then 
replies to the switch.
3. The switch forwards the RADIUS server’s CA certificate to the video device, which also 
replies to the switch. 
4. The switch keeps track of all responses to the validation requests. If all certificates are 










