SecurityHacker Noonabout 6 hours ago
IEC 104 Explained: Protocol Stack, Frames, and Security
6 min read
IEC 60870-5-104 (IEC 104) is the TCP/IP-based telecontrol protocol for SCADA in power systems, using APCI and ASDU frames. The base protocol lacks native cryptographic security, but IEC 62351-3:2023 and IEC 62351-5:2023 define TLS and application-profile security mechanisms. IEC TS 60870-5-7:2025 covers security extensions for IEC 104.
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