Paper 2020/489

Pandemic Contact Tracing Apps: DP-3T, PEPP-PT NTK, and ROBERT from a Privacy Perspective

Fraunhofer AISEC


In this paper, we review different approaches on proximity tracing apps which are supposed to automate the current labor-intensive contact tracing approach conducted by national health officials. The purpose of these apps is to automatically notify people who are at risk of being infected with SARS-CoV-2 to interrupt infection chains as early as possible. However, a privacy-preserving and yet functional and scalable design of such apps is not trivial and in some parts leads to counter-intuitive properties. This paper reviews the most prominent European approaches, DP-3T, the German variant "NTK"' of PEPP-PT, and its closely related concept ROBERT. We discuss their design decisions from a privacy perspective and point out the fundamentally different adversary models assumed by the approaches. In addition, we touch on practical aspects such as scalability and ease of implementation.

Available format(s)
Publication info
Preprint. MINOR revision.
privacyproximity tracing
Contact author(s)
julian schuette @ aisec fraunhofer de
2020-05-08: last of 2 revisions
2020-04-28: received
See all versions
Short URL
Creative Commons Attribution


      author = {Fraunhofer AISEC},
      title = {Pandemic Contact Tracing Apps: DP-3T, PEPP-PT NTK, and ROBERT from a Privacy Perspective},
      howpublished = {Cryptology ePrint Archive, Paper 2020/489},
      year = {2020},
      note = {\url{}},
      url = {}
Note: In order to protect the privacy of readers, does not use cookies or embedded third party content.