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- W2279894564 abstract "In order to maintain a system’s security properties during evolution, it is importantto follow a principled way of evolution. Doing so will decrease both the time neededto be spent on evolution as well as the number of security risks and other errorsthat might arise during the process. One such principled way of evolution is touse change patterns. A change pattern always covers the evolution of two closelyintertwined artifacts on different levels of abstraction (such as requirements andsoftware architecture), and gives a principled way of evolving one of the artifactsbased on the changes made to the other. In this master’s thesis, a VoIP system known as Cryptify Call is evolved with thepurpose of identifying at least one such change pattern. The goal of the thesis ismore specifically to find a general solution on how to evolve a system from secureone-to-one into secure many-to-many communication, without violating any of thesystem’s security requirements along the way. Two alternative solutions to thisproblem are identified for the Cryptify Call system, which are then expressed asabstract and context-free change patterns. This ensures that the identified solutionsare applicable not only to the Cryptify Call system or other VoIP applications, butto any type of system with a suitable software architecture. Both of the identifiedchange patterns cover how the system’s software architecture has to evolve due tochanges made to the system’s functional requirements. In order to identify these change patterns, the Cryptify Call system’s software architectureand security requirements had to be modeled using UML and SI* notationrespectively, both before and after evolution. The most important roles in the softwarearchitecture for each of the solutions were then mapped to a template showingthe architectural-level transformation necessary to apply that change pattern. Whiletwo alternative change patterns are given in the thesis, only one of them was actuallyimplemented in the Cryptify Call system." @default.
- W2279894564 created "2016-06-24" @default.
- W2279894564 creator A5030552861 @default.
- W2279894564 date "2016-01-01" @default.
- W2279894564 modified "2023-09-26" @default.
- W2279894564 title "Evolution of a Secure Voice Communication System: A Change Pattern for Multiparty Conference Systems" @default.
- W2279894564 hasPublicationYear "2016" @default.
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