The National Institute of Standards and Technology on Tuesday released proposed revisions to its requirements that govern how agencies secure their federal information systems. Proposed changes to Special Publication 800-53, Revision 4, address new challenges that agencies face, including insider threats, supply chain risk, mobile and cloud computing technologies, and other cybersecurity issues and challenges, NIST said in a news release. “The changes we propose in Revision 4 are directly linked to the current state of the threat space — the capabilities, intentions and targeting activities of adversaries — and analysis of attack data over time,” NIST fellow Ron Ross…