MACsec and the MACsec Key Agreement (MKA) protocol are the foundational technologies protecting in-vehicle Ethernet communications. Employing existing IEEE standards, the OPEN Alliance Inc. Technical Committee 17 (TC17) authored a MACsec usage profile tailored to automotive use cases. ▶️ MACsec (IEEE ) provides robust Layer 2 security for Ethernet frames. It ensures: Authentication: Verifies the message source. Integrity: Confirms data hasn't been altered. Confidentiality: Offers optional data encryption. Replay Protection: Stops attackers from reusing old data packets. ▶️ MKA (IEEE ) is the key manager. It securely generates and distributes the dynamic, ephemeral keys that MACsec uses. This automated process ensures the security keys are fresh and extremely difficult to compromise. 00:00 MACsec & MACsec Key Agreement Intro 00:25 SDV/Zonal Cybersecurity 01:27 Automotive MACsec/MKA 05:05 MACsec/MKA - Terms 10:20 MACsec/MKA - Security Policy 12:46 MACsec in Automotive 14:37 MACsec Architecture 17:26 MACsec PDU - Frame Format 20:04 MACsec PHY - Tx Processing 21:34 MACsec PHY - Rx Processing 23:22 MKA - Key Distribution 26:27 MKA Architecture 28:49 MKA - MKAPDU Structure 30:15 MKA Parameter Sets 38:42 MKA Init Sequence 43:43 MKA Rekey Sequence 48:31 Conclusion