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Figure 8.2 : Mapping from (a) per-user credits to (b) per-link credits. cannot compute a user balance by taking the sum of the link balances – in fact, the concept of a user balance is no longer useful because a user can create many identities and establish links between them. Instead, we introduce a new mechanism for credit transfer that uses link balances, rather than user balances, to bound the amount of unwanted communication that users can send. We now describe this mechanism for transferring credits. For simplicity, we first describe the case of communication between users who are friends in the trust network. We then generalize the credit transfer mechanism to the case in which two arbitrary users wish to communicate. Communication among friends As in the strawman design, a user who wishes to send communication needs to obtain a token during the authorization phase. For example, a user X may request to send communication to another user Y , a friend of X’s. Ostra determines whether transferring this credit would violate the link balance range on the X ↔ Y link, and if not, it issues a signed token. The token is then included in X’s communication to 164PDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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