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Title page 1
Contents 3
Highlights 2
Letter 6
Background 10
Overview of Cryptography 11
Overview of Quantum Computing 14
Federal Roles and Responsibilities for Adopting Cryptography and Supporting Quantum Computing 15
Quantum Computers Pose Significant Threats to Cryptography on Federal Systems 17
Threat Actor Use of a Quantum Computer Would Have Devastating Impacts to Federal Systems 17
Estimates Vary on When a Cryptographically Relevant Quantum Computer Will Be Developed 21
Agencies Have Not Fully Implemented Preparatory Practices for Addressing Quantum Cyber Threats 25
Agencies Have Not Fully Developed Prioritized Inventories of Systems with Vulnerable Cryptography 27
Agencies Have Not Fully Identified Funding Needed to Transition to Post-Quantum Cryptography 34
Agencies Have Not Tested Post-Quantum Cryptography 36
Conclusions 38
Recommendations for Executive Action 39
Agency Comments and Our Evaluation 39
Appendix I: Objectives, Scope, and Methodology 42
Appendix II: Summary of China's Efforts to Prioritize Quantum Information Science Development 50
Appendix III: Summary of National Quantum Computing Cybersecurity Strategy 53
Appendix IV: Comments from the Department of Homeland Security 56
Appendix V: Comments from the Social Security Administration 58
Appendix VI: GAO Contact and Staff Acknowledgments 59
Figure 1. A Simple Illustration of a Public-Key Cryptography Method Used to Protect Data 12
Figure 2. Units for Processing Information Used in Classical Computing Versus Quantum Computing 14
Figure 3. Thirty-Two Quantum Experts' Predicted Timeline for the Development of a Cryptographically Relevant Quantum Computer,... 22
Figure 4. Extent to Which the 24 Chief Financial Officers Act Agencies Addressed Preparatory Practices for Migrating to Quantum Computing 27
Figure 5. Ranked Number of Quantum Computing Patents Filed Prior to June 2023 51
Figure 6. Share of Global Quantum Computing Articles Published between 2011-2020 52
Figure 7. The Three Central Goals of the U.S. National Quantum Computing Cybersecurity Strategy 53
Figure 8. Central Goals Outlined in the Documents That Comprise the U.S. National Quantum Computing Cybersecurity Strategy 54
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