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193 During authorization, the sender sends a signed authorization request message along the path. This request includes a unique identifier, the public key of the desti- nation, and the destination’s bloom filter and coordinate. Each user along the path (i) forwards the message, (ii) updates the balances and bounds of the message’s incoming and outgoing links according to the rules stated below, (iii) records the destination, request identifier, previous hop, next hop, and expiration time of the request, and (iv) sets a timer for the expiration time. When the destination receives the request, it issues a signed token and sends it directly to the sender. The link bounds are updated as follows. Each user along the path increments the lower bound L for the next hop, as was done in the centralized Ostra described in Section 8.2. Thus, the state of the network after a token is issued is exactly as shown in Figure 8.4 (b). During classification, the destination sends a signed classification message along the path in the reverse direction. Each user checks if she has a record of a matching authorization request. If so, the adjustments of the link bounds performed during the authorization are undone, and the link balances are adjusted as described below. The message is then forwarded, and the record is deleted. Otherwise, if no matching record exists, the message is ignored. The link balances are adjusted as was done in the centralized case. If the message was classified as wanted, the link balances are not changed, as shown in Figure 8.4 (d). However, if the message was classified as unwanted, each user raises the credit balancePDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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