Rockwell Automation Publication 2080-UM002M-EN-E - April 2022 95
Chapter 6 Micro870 Controller Distributed Network Protocol
Update Key Change Method and Certificate Authority Key
A Certificate Authority Key is a Symmetric (encrypted) or Public (not
encrypted) key that is stored in the controller for authentication with the DNP3
master when a Key change request is processed.
The type of key used in the certificate is based on the Update Key Change
Method setting that you have selected in the configuration. To define the key,
select one of the following settings.
• To use Symmetric Key in authorization:
- AES-128/SHA-1-HMAC
- AES-256/SHA-256-HMAC
• To use Public Key in authorization:
- RSA-2048/RSA SHA-256/SHA-256/HMAC
- RSA-3072/RSA SHA-256/SHA-256-HMAC
To configure the Certificate Authorization Key, click Configure.
To define a Symmetric Key, enter 32 or 64 characters into the field, depending
on the Update Key Change Method that you have selected. Click OK to accept
and encrypt the key.
IMPORTANT
This feature is only available in Secure Authentication Version 5.
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