https://tech.newstatesman.com/security/pepp-pt-vs-dp-3t-the-coronavirus-contact-tracing-privacy-debate-kicks-up-another-gear

A stark schism in the approach towards coronavirus contact-tracing apps is continuing to divide Europe. On one side of the divide is a consortium of academics and business stakeholders converging under the PEPP-PT (Pan-European Privacy-Preserving Proximity Tracing) umbrella. This group has created a so-called “privacy preserving” Covid-19 contact-tracing solution, that is currently being implemented by German and Italian governments. One of its members, Christophe Fraser, Professor at the Nuffield Department of Medicine at University of Oxford, is also involved with the development of the UK government’s NHSX app.

On the other side of the divide is DP-3T, a group of privacy-minded academics that has developed an entirely decentralised solution to coronavirus contact-tracing that retains data on handsets, rather than sending it to a centralised database run by, for example, a country’s health service. This is the main point of contention between the groups: centralisation vs decentralisation.