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Educational institutions have increasing needs for professional digital communication. When selecting suitable communication tools, there is a need for appropriate information as a basis for decision-making. Messenger communication in particular is strongly integrated into people's private everyday lives. While needs for extensive data-secure communication in educational contexts are increasing, there is a lack of concepts for data-protected and privacy-preserving support of educational processes through software (Karaboga et al 2014; Digitalcourage e.V. n.d.) , as well as for mandatory training for professionals (Zorn, Tillmann, and Kaminski 2014; Imort and Niesyto 2014), and reliable information for viable software alternatives. This paper outlines the specific requirements of educational institutions when selecting suitable software, using messenger communication as an example. From these requirements, criteria for needed information are presented as a basis for software selection decisions in three categories: data protection/privacy, accessibility/low-barrier, practicability. Since no criteria and good practice suggestions were available so far, a study was conducted to elicit the characteristics of potentially suitable messenger software. To this end, the necessary criteria for the three categories mentioned were first defined and then German and well-known international messengers were tested for data protection criteria. Based on the results for conformity with the EU's General Data Protection Regulation (GDPR) as an inclusion criterion, the messengers in question were subjected to a practical test. In the process, additional practicality criteria were developed, in part iteratively.
In addition to institution-internal messengers, six services were identified among the freely available provider-dependent messengers that can be used in a GDPR-compliant manner, at least for users over the age of 16. At the time of publication, this leaves only five: Threema, Wire, SID, Ginlo, Chiffry. Furthermore, provider-independent messenger systems that adhere to the international standard protocol for the exchange of chat messages (XMPP) appear to be a viable option for educational institutions. In-house or commissioned server hosting would then be possible and a corresponding agreement for commissioned data processing can be concluded with an IT service provider.
The decisions to use "Wire" and "Threema Work" in the IDiT project context are explained and justified. The context was vocational training for prospective office management clerks at vocational schools and vocational training centers. Although the underlying considerations are tailored to the project context (application in the Berufsförderungswerk Köln), they can be generalized.
A test tool for Langton's ant-based algorithms is created. Among other things, it can create test files for the NIST-Statistical-Test-Suite. The test tool is used to investigate the invertibility, ring formation and randomness of 7 created models which are extensions of Langton’s ant. The models are examined to possibly use them as pseudo-random generator (PRG) or block cipher. All models use memories which are based on tori. This property is central, because this is how rings are formed in the first place and in addition the behavior of all models at the physical boundaries of the memory is clearly defined in this way. The different models have special properties which are also investigated. These include variable color sets, discrete convolution, multidimensionality, and the use of multiple ants, which are arranged fractal hierarchically and influence each other. The extensions convolution, multidimensional scalable and multidimensional scalable fractal ant colony are presented here for the first time. It is shown that well-chosen color sets and high-dimensional tori are particularly well suited as a basis for Langton's ant based PRGs. In addition, it is shown that a block cipher can be generated on this basis.
With Google’s Flutter framework continuing to grow in popularity for companies and developers alike, the need for an understanding of how to utilize the framework in a large-scale context has become more relevant than ever. The purpose of this thesis is to document the crucial steps most development teams using Flutter in a large-scale application will face. Additionally, a fully documented, large-scale reference application was generated so that other developers may use it as an aid when creating their own Flutter projects on a similar scale. Multiple steps were taken to ensure that optimal solutions were chosen for each aspect of the development process. For each of those aspects, a wide range of possible solutions were explored, compared and analysed. Finally, one of the possible solutions was chosen based on a wide range of scientific papers and community-generated sources. Additionally, an interview with an expert in the field was conducted to further validate those decisions. After the application was fully implemented, ten crucial aspects of the development process were identified. Those ten aspects are now explained in detail in this thesis. Ultimately, the knowledge provided by this thesis can act as a map for peers using Flutter in a large-scale context and help them overcome the crossroads they will most likely come to face.
An empirical evaluation of using the Swift language as the underlying technology of RESTful APIs
(2016)
The purpose of the current thesis is to determine the appropriateness of using the Swift language as the underlying technology for the development of RESTful APIs in a Linux environment. The current paper describes the process of designing, implementing and testing individual RESTful API components based on Node.js, PHP, Python and Swift and seeks to determine whether Swift is a viable alternative.
The thesis begins by defining a methodology for implementing and testing individual RESTful API components based on Node.js, PHP, Python and Swift. It then proceeds to detail the implementation and testing processes, following with an analytic discussion regarding the advantages and drawbacks of using the Swift language as the underlying technology for RESTful APIs and server-side Linux-based applications in general.
Based on the implementation process and on the results of the previously mentioned evaluation phase, it can be stated that the Swift language is not yet ready to be used in a production environment. However, its rapid evolution and potential for surpassing its competitors in the foreseeable future make it an ideal candidate for implementing RESTful APIs to be used in development environments.