Allows additional checks to be added as new threats arise due to the modular nature of the application.
Provides scalable framework for GNSS-based PNT manipulation detection that offers varying levels of protection based on the available data.
Provides spoofing detection capabilities for GNSS-based PNT sources using available receiver PNT solutions and observables and, when possible, other measurements and data available in the antenna / receiver processing chain.
Intended for GNSS receiver and GNSS-based timing server Original Equipment Manufacturers (OEMs) for use in future development or integration into existing products and platforms.
These resources advance the design of PNT systems and increase resilience of critical infrastructure to PNT disruptions.
Discusses the regulatory timing requirements and GPS timing dependencies of United States critical infrastructure systems operating in the financial, telecommunications, and electric power sectors.Īs part of industry engagement, DHS S&T has published the PNT Integrity Library and Epsilon Algorithm Suite to protect against Global Navigation Satellite System (GNSS) spoofing, or deceiving a GPS device through false signals.
Provides an overview of how timing systems work and defines some basic terminology and specifications.
Describes, proposes, and recommends technical methods that NIST has already implemented, or can potentially implement, to fulfill Section 4, Part (i) of the PNT Executive Order.Īn Evaluation of Dependencies of Critical Infrastructure Timing Systems on the Global Positioning System (GPS).
Utilizes input data validation based on whitelist constraints to minimize the processing of malformed navigation messages entering a GPS receiver.Ī Resilient Architecture for the Realization and Distribution of Coordinated Universal Time to Critical Infrastructure Systems in the United States: Methodologies and Recommendations.
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Presents a software assurance approach as a means of addressing potential vulnerabilities and increasing reliability of GPS receivers.
Facilitates development and adoption of those behaviors through a common framework that enables improved risk management, determination of appropriate mitigations, and decision making by end-users.
Provides guidance for defining expected behaviors in resilient PNT equipment.
Improving the Operation and Development of Global Positioning System (GPS) Equipment Used by Critical Infrastructure (PDF, 21 pages, 512 KB)ĭHS S&T has published resources for critical infrastructure and its stakeholders.
Best Practices for Improved Robustness of Time and Frequency Sources in Fixed Locations (PDF, 10 pages, 465.67 KB).
Through these sustained efforts, the goal of the program is to increase the resiliency of critical infrastructure to GPS vulnerabilities in the future.Įxamples of measures that can be taken to enhance resiliency can be found in the following DHS best practice documents released via the Industrial Control Systems Cyber Emergency Response Team (ICS-CERT): To address GPS vulnerabilities in critical infrastructure, S&T’s Positioning, Navigation, and Timing (PNT) Program has a multi-pronged approach of conducting vulnerability and impact assessments, developing mitigations, exploring complementary timing technologies, and engaging with industry through outreach events and meetings. However, GPS’ space-based signals are low-power and unencrypted, making them susceptible to both intentional and unintentional disruption. Precision timing is particularly important and is primarily provided through the Global Positioning System (GPS). Accurate positioning, navigation, and timing (PNT) is necessary for the functioning of many critical infrastructure sectors.