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General

CompanyON: Serving as gutSTEIN

Our gift card solution for regional brick-and-mortar stores and restaurants has been successfully used in Stein am Rhein for almost a year. As of today, the local version for Stein am Rhein, provided by the regional business association, also has a local name: gutSTEIN. The card has become an important asset for the local shopping […]

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General

Contact Tracing — Quo Vadis?

How much we are all looking forward to returning to normal lives: Meeting friends, hugging family, a cool beer, culture. After more than a year, we really deserve it! However, there are still roadblocks in the form of a bloody virus and the countermeasures. Anyone promising a quick end is hailed as a saviour. (This […]

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Editorial

Electronic Vaccination Certificate: Eureka! Eureka?

When I was reading the original “Spiegel” article on the German Electronic Vaccination Certificate, I was fascinated.

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How-to Open Source

Generating Multi-Architecture Docker Images Made Easy

Docker is cool and portable, but distributing Dockerfiles comes at a disadvantage: The demands on the build environment are high. Distributing Docker images solves this, but building them for an architecture other than your CPU architecture seems complicated. Here is a simple solution.

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Publications

HomeCA: Scalable Secure IoT Network Integration

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Editorial General

A brief history of time(stamping)

This entry is part 2 of 2 in the series Timestamping

When I tell people about timestamping, they often react with, „Ah, yes, that Blockchain thing“. However, timestamping is as old as civilisation and has some interesting properties it gains from non-Blockchain applications. So let’s go back a few millenia first.

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Editorial General

Timestamping: Why should I care?

This entry is part 1 of 2 in the series Timestamping

Timestamping documents is the basis for many forms of trust and evidence. As such, it is a building block for contracts and agreements, and dispute resolution.

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Editorial How-to Open Source Tutorial

A SIP library is born

This entry is part 3 of 3 in the series Telephony of Everything

Inspired by Andrijan Möcker’s „Ãœberallklingel“ (Everywhere Bell), I decided to create my own. However, I wanted to use it with a motion sensor and therefore to be able to turn it off and on again, when necessary. I also felt that using Asterisk was overkill and it could be done quickly and much easier with […]

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Editorial General

The Phone Advantage

This entry is part 2 of 3 in the series Telephony of Everything

Smartphones and apps have been hyped for over a decade now. But sometimes, the smartphone is not the smartest thing to get an interaction done. A dedicated device or even a plain old phone may be better. Let us look at some advantages of telephones.

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Editorial General How-to

Telephony of Everything: From IoT to ToE

This entry is part 1 of 3 in the series Telephony of Everything

We all know about the Internet of Things. Cool or useless gadgets, which are each controlled by their individual app on our smartphone. This is often very convenient, but not always.