In this paper, we have introduced a new type of leakage associated with
modern encrypted databases called update pattern leakage. We formalize the
definition and security model of DP-Sync with DP update patterns. We also
proposed the framework DP-Sync, which extends existing encrypted database
schemes to DP-Sync with DP update patterns. DP-Sync guarantees that the entire
data update history over the outsourced data structure is protected by
differential privacy. This is achieved by imposing differentially-private
strategies that dictate the data owner’s synchronization of local~data.

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