“…This is done by homomorphic encryption, i.e., encrypting the readings in a way that the encrypted ciphertexts can be added up, and the sum of ciphertexts -and only the sum-can then be deciphered to show the sum of the plaintexts. This approach, where applicable, is superior to collecting data and then restricting access to it (which creates a security problem as well, and has failed numerous times in the past) or anonymizing the smart grid data, which has also been shown to be insufficient [2]. To go one step further and make this technology applicable for a real roll-out, it is vital to show these advantages, demonstrate how aggregation protocols can be used in a real setting, and validate applicability, performance, and robustness.…”