Abstract: Method of providing anonymized data comprises: first server connected to first data source generates shared encryption key and receives, from networked location, first message comprising first encrypted identifier that it is unable to decrypt. The first server generates shared encryption key and generates, from the first data source, first dataset that may include data corresponding to the first encrypted identifier, and returns it to the networked location. To generate the first dataset, the first server obtains, from the first data source, set of at least one local unencrypted identifier. For each local unencrypted identifier, it verifies, using the shared encryption key, the first encrypted identifier against the local unencrypted identifier to obtain successful or failed verification. If the verification is successful, it obtains, from the first data source, first corresponding data that is associated with the local unencrypted identifier, wherein the first dataset comprises this first corresponding data.