
The concepts of the Hashed Message Authentication Code (HMAC) and challenge-
response as defined in the DNP3 specification for Secure Authenticate Version 2.0
document is employed.
When authentication is enabled, the following settings should be selected:
•
HMAC Algorithm and Update key
•
Challenge Response timeout
•
Duration of session key
•
Aggressive Mode
•
Critical Request Function Codes
Before TCC600® allows a user to change the Update key, the user has to
enter the old update key.
GUID-7C5B6EAC-2631-430D-8A13-964935CA4EBB V1 EN
Figure 460:
Configure Update Keys and Critical Request Function Codes Dialog
Screen
HMAC Algorithm and Update Key
The HMAC algorithm is either SHA1 (4 OCT) or SHA1 (10 OCT). An Update key is
necessary to provide secure SESSION key negotiation. Once a SESSION key is obtained
any subsequent challenge/ response session will employ that session key. The Update key
can be up to 32 hex characters (0123456789ABCDF) (128 bits).
1VAC388793-MB A
Section 12
Appendix C DNP Configuration Editor
TCC300
675
User Manual
Содержание TCC300
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