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NIST releases Guide to LTE Security (NIST SP 800-187), a report that provides information to organizations about the security capabilities of cellular networks based on 4th generation (4G) Long Term Evolution (LTE) technology. Cellular technology plays an increasingly large role in society, as it has become the primary portal to the internet for a large segment of the population. One of the main drivers making this change possible is the deployment of LTE cellular technologies. This report discusses the fundamentals of how LTE networks operate, explores the LTE security architecture., and analyzes the threats posed to LTE networks and supporting mitigations.