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161 Extending Ostra to work with unmoderated multi-party communication systems is beyond the scope of this thesis. 8.2 Ostra design The strawman design described in the previous section requires strong user identities: that is, each individual user is guaranteed to have at most one unique digital identity. Such identities are not practical in many applications, as they require a background check as part of the account creation process. Such checks may not be accepted by users, and as far as we know, few services that require such a strong background check have been widely adopted on the Internet. In this section, we refine the design of Ostra so that it does not require strong user identities. It is assumed that the communication system ensures that each identity is unique, but an individual user may sign up multiple times and use the system under different identities at different times. Our refined design leverages relationships to preserve Ostra’s properties despite the lack of strong user identities. We still assume that a trusted entity such as a Web site hosts the communication service and runs Ostra. Later, in Section 8.5, we sketch out how Ostra could be applied to decentralized services. The refined design of Ostra replaces the per-user credit balances with balances that are instead associated with the links among users in a trust network. We show that this mapping preserves the key properties of the strawman design, even thoughPDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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