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One of the differences between typical peer-topeer (P2P) and client-server systems is the existence of user accounts. While many P2P applications, like public file sharing, are anonymous, more complex services such as decentralized online social networks require user authentication. In these, the common approach to P2P authentication builds on the possession of cryptographic keys. A drawback with that approach is usability when users access the system from multiple devices, an increasinglydoi:10.1109/p2p.2012.6335797 dblp:conf/p2p/KreitzBGRB12 fatcat:tu2phvq6cfg2jcvlm255lorsge