Data aggregation is an efficient way to minimize energy consumption on sensors. In this paper, we Propose scheme is a practical secure data aggregation scheme, RSA, based on an additive homomorphic encryption scheme, an identity-based signature scheme, and a batch verification technique with an algorithm for filtering injected false data. In this design an encryption, decryption and signature techniques are used and also the base station can recover all sensing data even these data has been aggregated. The base station can perform any aggregation function on them. Without compromising any nodes an attacker can interrupt the network system. The hierarchical RSA algorithm is detects the malicious behavior of the nodes.