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\caption{Architectures for secure data exchange among users: (a) by the use of an additional server, (b) via a \ac{P2P} network connecting all users or (c) via a hybrid \ac{P2P} network with servers acting as super-peers.}
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\caption{Architectures for secure data exchange among users: (a) by the use of an additional server, (b) via a \ac{P2P} network connecting all users or (c) via a hybrid \ac{P2P} network with servers acting as super-peers.}
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One possibility is to use an extra infrastructure to store the data, as shown in Figure \ref{fig:solution-architecture-a}. An additional server stores and distributes the private data to be protected. Using a server has the advantage that the data are always available and there are no dependencies to other hybrid \ac{OSN} users. Furthermore, resources only have to be available centrally and not locally on the user's device. At the central location, the data can be indexed and explicitly queried. However, the operation and maintenance of one or more servers are problematic. In principle, the question for the service provider has to be clarified, because the reliability of the infrastructure is essential. FaceCloak (see Chapter \ref{sec:facecloak}) used an architecture based on this structure.
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One possibility is to use an extra infrastructure to store the data, as shown in Figure \ref{fig:solution-architecture-a}. An additional server stores and distributes the private data to be protected. Using a server has the advantage that the data are always available and there are no dependencies to other hybrid \ac{OSN} users. Furthermore, resources only have to be available centrally and not locally on the user's device. At the central location, the data can be indexed and explicitly queried. However, the operation and maintenance of one or more servers are problematic. In principle, the question for the service provider has to be clarified, because the reliability of the infrastructure is essential. FaceCloak (see Chapter \ref{sec:facecloak}) used an architecture based on this structure.
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