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Contact tracing is an important instrument for national health services tofight epidemics. As part of the COVID-19 situation, many proposals have beenmade for scaling up contract tracing capacities with the help of smartphoneapplications, an important but highly critical endeavor due to the privacyrisks involved in such solutions. Extending our previously expressed concern,we clearly articulate in this article, the functional and non-functionalrequirements that any solution has to meet, when striving to serve, not merecollections of individuals, but the whole of a nation, as required in face ofsuch potentially dangerous epidemics. We present a critical informationinfrastructure, PriLock, a fully-open preliminary architecture proposal anddesign draft for privacy preserving contact tracing, which we believe can beconstructed in a way to fulfill the former requirements. Our architectureleverages the existing regulated mobile communication infrastructure and buildsupon the concept of "checks and balances", requiring a majority of independentplayers to agree to effect any operation on it, thus preventing abuse of thehighly sensitive information that must be collected and processed for efficientcontact tracing. This is enforced with a largely decentralised layout andhighly resilient state-of-the-art technology, which we explain in the paper,finishing by giving a security, dependability and resilience analysis, showinghow it meets the defined requirements, even while the infrastructure is underattack.

PriLok: Citizen-protecting distributed epidemic tracing