Explore a conference talk from CCS 2016 that introduces SANA (Secure and Scalable Aggregate Network Attestation), a novel approach to remote attestation for large-scale networks. Delve into the challenges of securing networks under physical attacks, key requirements, and objectives of the system. Examine the proposed model, which leverages Co-Diffie-Hellman problems, multi-signature schemes, and aggregate signature schemes. Learn about Optimistic Aggregate Signatures (OAS) and their efficiency in the context of SANA. Analyze the security considerations for both OAS and SANA's attestation process. Review evaluation results and conclusions drawn from the research, presented by experts from the University of Padua, TU Darmstadt, IBM Research, and Intel Labs.