Introduction During the Covid-19 epidemic, one of the biggest common recurring global issues has been the ability to perform mass testing of populations, addressing both the dual needs of public health reporting (statistical) and private citizen privacy protection. Materials and methods Research was conducted to determine current methods of reporting and limitations of these current methods, application of new privacy enhancing technologies and self sovereign identity impact of self reporting and means of both authenticating self reporting and binding an identity to tests and subjects in a secure and privacy preserving manner. Results Conclusions Current centralized reporting addresses public health reporting. However, no easy way for citizen to share results with a third party and control who sees these results. Use of ”self sovereign” identity can enable a citizen to selectively share information to a third party. New forms of zero knowledge proofs that work with blockchains – ZKSnarks, can be used to both provide privacy protection and home testing validation. Stephen Holmes, PGR FEPS Computer Science, Surrey University s.a.holmes@surrey.ac.uk Citizen reporting and privacy protection in a post Covid-19 world Acknowledgments Thank you to Simons institute at UC Berkeley for enabling me to participate in Lattice cryptography bootcamp where I was introduced to the full capabilities of lattice-based cryptography. Zero Knowledge Proof conference – At home edition (5 weeks in May 2020) to enable participation in Zero Knowledge Proofs standardization activities. My PhD supervisor: Kaitai Liang, who has encouraged me to investigate what was a detour from my current research, applying this to the Covid testing challenges. Literature cited Short Non-interactive Zero-Knowledge Proofs, Jens Groth, University College London https://www.iacr.org/archive/asiacrypt2010/6477343/6477343.pdf Shafi Goldwasser, Silvio Micali, and Charles Rackoff. The knowledge complexity of interactive proofs. SIAM Journal of Computing, 18(1):186–208, 1989. Bitcoin: A Peer-to-Peer Electronic Cash System, Satoshi Nakamoto ZoKrates - Scalable Privacy-Preserving Off-Chain Computations July 2018 DOI: 10.1109/Cybermatics_2018.2018.00199 Distributed Auditing Proofs of Liabilities, Konstantinos Chalkias, 2020, https://eprint.iacr.org/2020/468.pdf , Further information The project is currently under active development with a view to commercialise this research. Currently in discussion to include this with other Covid reporting protocols and applications. Today Future Traditional health care systems with health care professionals involvement Data is recorded on blockchain/ or Distributed ledger. Result is off-chain so can be deleted Reporting not optimized for speed Multiple data stores to interrogate to get statistical snapshot Blockchain enables authorities to automatically collect statistical data Identity is explicit government issued identity Identities are pseudo anonymous Can be part of Self Sovereign identity. Citizen needs to request certificate from health care professionals. Citizen generates proof on request and shares proof with third party. Can specify expiry date and identity of receiving third party. Overview The starting point for this research was an investigation of how privacy may be enhanced through the application of zero knowledge proofs to address the issue of how to empower a citizen to be in control of their Covid19 test results. Given the ongoing research on immunity passports and the development of home testing kits, the biggest problem appeared to be – How do you prove that you took a test to a third party without compromising an individual’s privacy? What became apparent in the first stage of Investigation was that the home testing cassettes were designed to be mass produced an anonymous. However, without the involvement of a medical health professional there is no easy way to prove you took the test and prove what the results were to a thir