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8.3.4 Compromised user accounts If a user’s account password is compromised, the attacker can cause the user to run out of credit by sending unwanted communication. However, the amount of unwanted communication is still subject to the same limits that apply to any individual user. Moreover, a user would quickly detect that her account has been compromised, be- cause she would find herself unable to generate communication. 8.4 Evaluation In this section, we present an experimental evaluation of our Ostra prototype. Using data from a real online social network and an email trace from our institute, we show how Ostra can effectively block users from sending large amounts of unwanted communication. 8.4.1 Experimental trust network To evaluate Ostra, we used a large, measured subset [105] of the social network found in the video-sharing Web site YouTube [167]. We extracted the largest strongly connected component consisting of symmetric links from the YouTube graph, which resulted in a network with 446,181 users and 1,728,938 symmetric links. Strictly speaking, the YouTube social network does not meet Ostra’s requirements, because there is no significant cost for creating and maintaining a link. Unfortunately, trust-based social networks that do meet Ostra’s requirements cannot be easily ob- 175PDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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