Abstract: To solve the issues of security of multi-source heterogeneous data during data aggregation in wireless sensor networks(WSNs),this paper proposed a lightweight secure data aggregation scheme which can guarantee data confidentiality,integrity and freshness.HASH function is used to update the key of each time slot by using present aggregation round and preset key as an input.The application of homomorphic encryption makes intermediate node perform aggregation operation on ciphertext directly.Homomorphic message authentication code (HMAC) enables base station to verify whether the aggregation data have been modified during transportation.Moreover,plaintext is coded before being encrypted so as to satisfy multiple applications.Theoretical analysis and simulation verify that the proposed algorithm can preserve data privacy with lower communication assumption and higher data aggregation accuracy.

Key words: Secure data aggregation,Homomorphic encryption,Homomorphic message authentication code(HMAC),Multiple applications