Rockwell Automation Publication 2080-UM002N-EN-E - November 2022 87
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.
To define a Public Key, you must generate an RSA-2048 or RSA-3072 Public Key, depending on
the Update Key Change Method that you have selected, and enter it into the field. Click OK to
accept the changes. Public Keys are not encrypted.
IMPORTANT This feature is only available in Secure Authentication Version 5.
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