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  • 1.
    Pettersson, David
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Computer science.
    Utveckling av ett krypterat meddelandesystem2018Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Today there exists many messaging applications and new ones are released almost daily. However, there are not as many messaging applications where both the client application and the server application are open source and can be self hosted. These messaging applications are good at solving the problem that many, up to several million people can communicate with each other. However, there is a smaller more focused use case with a messaging system consisting of only one message flow, where all messages are visible to all devices. This smaller use case means that less metadata is required. Uses for such a messaging system may be to receive notifications from servers or to take personal notes. The message system is synchronized between all devices. The goal of this project is to create an End-to-End encrypted messaging system that provides authentication, data integrity and confidentiality. Research has been investigated regarding weaknesses in some encryption techniques, these weaknesses have been taken into account when creating the messaging system. The purpose why this messaging system needs to be created is because an existing system that meets certain essential requirements for maintaining maximum personal integrity is missing. A prototype has been created that consists of a server application and a graphical computer application. Messages sent in the messaging system are End-to-End encrypted. Communication between clients and the server is also encrypted and authenticated.

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