In the previous parts of this blog series I introduced the general principle of asymmetric cryptography and explained how one can use the Diffie-Hellman Key Exchange to establish a shared secret among multiple parties over an unsecure channel. In this blog I will introduce you to... READ MORE

In the first part of this blog series I explained the drawbacks of symmetric encryption/decryption and how asymmetric cryptography can help to overcome these deficiencies. In this blog I will explain how and why it works so well and will describe how two parties can exchange a... READ MORE

Heute zeige ich Ihnen, wie Sie Zwei-Faktor Authentifizierung in Ihre Anwendung integrieren können. Dazu verwenden wir Time-based One-time Passwords (TOTP), das ich schon in einem vorherigen Artikel vorgestellt habe. User Interface Für den Benutzer sollte die Aktivierung möglichst... READ MORE

Aus Erfahrung ist bestens bekannt, welche Voraussetzungen einen Projekterfolg ermögliche, unterstützen oder gar verhindern. Die bewährte Methode 12! (c) nutzt einerseits die Erfahrung – oder das Bauchgefühl – stellt aber dank dem Systematischen Aufbau sicher, dass ein... READ MORE

In everyday life – private and business – often the problem occurs where you want to send a secret message over a public, unsecure channel. Such a message could be an email, a binary image for the latest firmware of your device or even a video conference with your... READ MORE

Wer kennt das nicht – das Release Datum für die neue Software steht vor der Tür und man muss die gerade erstellte Software „nur“ noch Testen… Zum Glück wurden alle Testcases schon im Voraus definiert und man kann nach Testdrehbuch alle vorgesehenen Tests abarbeiten und alle... READ MORE

Motivation for reactive programming Some applications (not only in embedded computing) are dealing with the visualization of states of an underlying process or hardware. Other applications may have a lot of user interface (UI) components that are depending on each other. In both... READ MORE

The sample code for this post can be found here. In the last three posts (part 1, part 2, part 3) we developed our Songster application. Due to new and changing requirements, our code has become quite complex and convoluted at places. There are also some issues with the app. For... READ MORE

The sample code for this post can be found here. The Songster app we’ve been developing over course of my first and second post has been growing steadily. With growth and with additional requirements comes an increase in complexity. Our model-view-presenter pattern along with our... READ MORE