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Award ID contains: 1814753

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  1. ; (, IEEE Symposium on Security and Privacy Posters)
    Accepted Manuscript Full Text Available
  2. ; (, IEEE Symposium on Security and Privacy Posters)
    Accepted Manuscript Full Text Available
  3. ; (, IEEE Symposium on Security and Privacy Posters)
    Accepted Manuscript Full Text Available
  4. ; (, Proceedings of the 18th ACM Workshop on Privacy in the Electronic Society)
    In this paper, we describe Mobile CoWPI, a deployable, end-to-end secure mobile group messaging application with proofs of security. Mobile CoWPI allows dynamic groups of users to participate in, join, and leave private, authenticated conversations without requiring the participants to be simultaneously online or maintain reliable network connectivity. We identify the limitations of mobile messaging and how they affect conversational integrity and deniability. We define strong models of these security properties, prove that Mobile CoWPI satisfies these properties, and argue that no protocol that satisfies these properties can be more scalable than Mobile CoWPI. We also describe an implementation of Mobile CoWPI and show through experiments that it is suitable for use in real-world messaging conditions. 
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  5. ; (, Proceedings of the 2018 ACM SIGSAC Conference on Computer and Communications Security)
    Existing End-to-End secure messaging applications trust a single service provider to deliver messages in a consistent order to a consistent group of conversation members. We propose a protocol that removes this single point of failure by using multiple service providers, enforcing conversation integrity as long as one service provider out of N behave honestly. However, this approach could potentially increase the number of entities that learn the metadata for a conversation. In this work we discuss the challenges and provide a protocol that limits the metadata leakage to that of existing messaging applications while still providing strong conversation integrity. 
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