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Event Invitations in Privacy-Preserving DOSNs

Abstract : Online Social Networks (OSNs) have an infamous history of privacy and security issues. One approach to avoid the massive collection of sensitive data of all users at a central point is a decentralized architecture.An event invitation feature – allowing a user to create an event and invite other users who then can confirm their attendance – is part of the standard functionality of OSNs. We formalize security and privacy properties of such a feature like allowing different types of information related to the event (e.g., how many people are invited/attending, who is invited/attending) to be shared with different groups of users (e.g., only invited/attending users).Implementing this feature in a Privacy-Preserving Decentralized Online Decentralized Online is non-trivial because there is no fully trusted broker to guarantee fairness to all parties involved. We propose a secure decentralized protocol for implementing this feature, using tools such as storage location indirection, ciphertext inferences and a disclose-secret-if-committed mechanism, derived from standard cryptographic primitives.The results can be applied in the context of Privacy-Preserving DOSNs, but might also be useful in other domains that need mechanisms for cooperation and coordination, e.g., Collaborative Working Environment and the corresponding collaborative-specific tools, i.e., groupware, or Computer-Supported Collaborative Learning.
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Guillermo Rodríguez-Cano, Benjamin Greschbach, Sonja Buchegger. Event Invitations in Privacy-Preserving DOSNs. Jan Camenisch; Simone Fischer-Hübner; Marit Hansen. Privacy and Identity Management for the Future Internet in the Age of Globalisation: 9th IFIP WG 9.2, 9.5, 9.6/11.7, 11.4, 11.6/SIG 9.2.2, International Summer School, Patras, Greece, September 7–12, 2014, AICT-457, Springer, pp.185-200, 2015, IFIP Advances in Information and Communication Technology (TUTORIAL), 978-3-319-18620-7. ⟨10.1007/978-3-319-18621-4_13⟩. ⟨hal-01431577⟩



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