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Targeting users Another concern is whether malicious users could collectively send a large amount of unwanted communication to a user, thus providing this victim with too much credit to receive any additional messages. This attack is possible when the attacking users collectively have more links to legitimate users than the victim, as exhausting the credit on one of the victim’s links requires the malicious users exhaust the credit on one of their own links. However, the victim has a simple way out by forgiving some of the debt on one of her links. If a user finds that she has too much credit on all of her links, she can forgive a small amount of debt from one of her friends. This is the same mechanism as transferring credit to the overflow account (C) described in Section 8.1. To see this equivalence, consider the star-topology trust network constructed in Section 8.2.2. In that case, a user transferring credit to the overflow account is essentially forgiving debt on their only link (to C). This mechanism does not allow malicious users to send additional unwanted communication to the victim, as the victim only forgives debt to her direct friend (i.e., the victim’s friend does not repeat the process). Targeting links One final concern is whether malicious users could prevent large numbers of innocent users from communicating with each other by exhausting the credit on certain links in the trust network. If successful, such an attack could prevent a group of users from 171PDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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