Outline of a Proposal and Conclusion

In this chapter, we discuss the future of digital contact tracing systems and the evolving role of cryptography in this regard. We mostly concentrate on how a decentralized system should be designed maintaining the privacy of the users. We first consider an ideal system and then move forward towards a more realistic one. The assumptions and cryptologic issues are explained. The system may also be used as a centralized one with certain design modifications. We discuss higher order contact tracing in terms of the neighborhood of a neighborhood, i.e., one more level of indirection. This is the concluding chapter of this brief manuscript.