Trust based Data Aggregation in Wireless Sensor Networks

trust based data aggregation scheme is secure and it provides both integrity confidentiality and authenticity for homogeneous and heterogeneous networks and this scheme evaluate the malicious behavior of the nodes. These data aggregation schemes provide better security compared with traditional aggregation since cluster heads can directly aggregate the cipher texts without decryption. In this design an encryption 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 trust management protocol detects the malicious behavior of the nodes. It is based on four trust components intimacy, honesty, energy, unselfishness of the nodes. It maintains two levels of trust SN-level trust and CH-level trust