This website was mostly translated automatically from the German version. We apologize for any translation errors.

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Zilp-Zalp!

Zilp-Zalp is a non-commercial, free and open source software solution for accessible and privacy-friendly digital-analog contact tracing.

An image showing the use of Zilp-Zalp for contact tracking in a restaurant.
A picture that illustrates the ease of installation and use of Zilp-Zalp.

Secure, privacy-friendly contact tracing for all of us

Zilp-Zalp is very easy to use. It requires no smartphone app installation for users and no complex registration processes for locality operators. The setup takes less than 5 minutes.

Barrier-free use through a combination of digital and analogue technologies.

Zilp-Zalp offers a simple, paper-based contact tracing process to complement digital-only use that excludes no one and offers the same high privacy guarantees as digital contact tracing.

An image showing a booklet with Zilp-Zalp QR codes illustrating analog, paper-based contact tracking.
A picture of a crossed-out surveillance camera, symbolizing the privacy-friendly design of Zilp-Zalp.

True Privacy By Design

Zilp-Zalp systematically reduces the collection and processing of personal data and offers better security & privacy guarantees than other systems. A use completely without personal data is also possible. Zilp-Zalp can also be operated in a decentralized and federated manner.

Why Zilp-Zalp?

Contact tracing should not be a business model. Contact tracing software with personal data should be designed for the common good and operated without commercial interests. It should also be strictly assessed in advance whether such contact tracing is necessary at all or whether completely anonymous solutions are preferable.

Zilp-Zalp is an open source, free-to-use software system for digital-analog contact tracing. It was designed according to Privacy By Design principles and systematically minimizes privacy & security risks for users of the system. The software also protects operators of localities and technically prevents the data collected for pure contact tracking from being used elsewhere.

Zilp-Zalp can very easily be operated in a decentralized manner, data can be stored fail-safe and redundantly in a federated infrastructure. Zilp-Zalp is also the only contact tracking system to implement strong cryptographic earmarking of data. An unprovoked decryption of these is not possible with Zilp-Zalp, the control over the data lies rather only with affected persons 1. In addition, Zilp-Zalp systematically minimizes opportunities to collect and analyze meta-data, which also poses a significant privacy risk in contact tracking systems in addition to the actual data collected. We believe that Zilp-Zalp is the most privacy-friendly contact tracking software system available. It also meets all legal requirements for contact tracking and should therefore be preferred over commercially operated systems.

Further information

Have a look at our documentation and our Github page to learn more about using Zilp-Zalp. Or just contact us !

  1. Zilp-Zalp can optionally implement an ombuds process that puts control over data in the hands of three (or more) independent controllers for exceptional cases. This allows data to be decrypted in specific cases (e.g. if a user loses a key). The ombuds process can be disabled. ↩