Siemens published an informative document on Security of their communication systems supporting IE 61850, IEC 60870-5-103, DNP3 etc:
SIPROTEC 5 Application Note
SIP5-APN-009:
Communication Architecture Under Cyber Security Aspects
I was a bit surprised that the IEC 61850-8-1 (MMS) communication in SIPROTEC 5 IEDs is not secured. The paper even does not mention the IEC 62351 series … which at least recommends to apply TLS for the TCP communication and MMS.
Click HERE to download the document.
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