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To address privacy concerns over online social networking services, several distributed alternatives have been proposed. These Peer-To-Peer (P2P) online social networks do not rely on centralized storage of user data. Instead, data can be stored not only on a computer of a profile owner but almost anywhere (friends' computers, random peers from the social network, third-party external storage, etc.). Since the external storage is often untrusted or only semi-trusted, encryption plays a fundamental role in security of P2P social networks. Encryption, however, also adds some overhead in both the time and space domains.
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