SECURE DATA AGGREGATION IN WIRELESS SENSOR NETWORKS VIA HOMOMORPHIC ENCRYPTION

Data aggregation is essential for wireless sensor networks to reduce data redundancy and to summarize relevant and necessary information without requiring all pieces of the data. Data confidentiality is another critical requirement for wireless sensor networks as these networks are usually deployed in hostile environments. In traditional data aggregation techniques, however, it is not possible to provide data confidentiality during data aggregation. In this study, we give an overview of the existing data aggregation techniques and examine how they interact with data confidentiality algorithms. In addition, we present a novel secure data aggregation protocol which is based on privacy homomorphic encryption. Due to privacy homomorphism, the proposed protocol allows data aggregation over encrypted data and therefore provides data confidentiality during data aggregation.