Abstract: The present disclosure generally relates to the secure exchange of data. In some implementations, an example method involves receiving data from a number of independent data sources. The method also includes storing the data in a central repository where at least a first portion of the data is homomorphically encrypted, receiving a data request from a data requester, and analyzing the stored data without decrypting the homomorphically encrypted data to determine an aggregated subset of data relevant to the data request. The aggregated subset of data may include at least some of the homomorphically encrypted data. The method also includes providing data request results that include or are derived from the aggregated subset of data to the data requester.