Dependencies: No Software is an Island
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In the past years, package managers, application frameworks and open-source libraries have made it vastly simpler and faster to get functioning software up and running, while cloud providers and external service providers have made it easier to get the application out into the hands of millions of users without large up-front costs. While this recent technology development has made it possible for companies with limited resources to build impressive software and valuable services, the development has serious security implications which the current state of software development and systems engineering are not yet able to handle very well. In this thesis, we will show that the security and availability of a system are largely determined by the surrounding "ecosystem" of dependencies, and that techniques to reduce the reliance on a system's dependencies-software libraries, services and infrastructures-are hugely beneficial. The intended audience for this thesis are computer scientists, professional and amateur software developers, and system designers, but anyone with basic IT knowledge is encouraged to keep reading.