Rapid progression of wireless engineering systems, a special domain of sensor network which supports medical diligences is the development of Autonomous Wireless Body Area Network. In this type of environment such as monitoring the health condition of senior citizens .The sensed signal can monitor several types of measurements such as Electroencephalography (EEG), Electrocardiography (ECG), Electromyography (EMG), Skin temperature, Skin conductance or Electrooculography (EOG) etc., compares with the standard level and the information is passed to the care takers or hospital for further necessary actions using a hybrid network of cryptography nowadays are crucial. The privacy information is vital and they have to be safe guarded from several aggressors. We propose a method of crypt analyst method using a cluster pattern of key mechanism provides assure, efficient and improved way to increase the lifetime of the network.-Rapid progression of wireless engineering systems, a special domain of sensor network which　 supports medical diligences is the development of Autonomous Wireless Body Area Network. In this type of environment such as monitoring the health condition of senior citizens .The sensed signal can monitor several types of measurements such as Electroencephalography (EEG), Electrocardiography (ECG), Electromyography (EMG), Skin temperature, Skin conductance or Electrooculography (EOG) etc., compares with the standard level and the information is passed to the care takers or hospital for further necessary actions using a hybrid network of cryptography nowadays are crucial. The privacy information is vital and they have to be safe guarded from several aggressors. We propose a method of crypt analyst method using a cluster pattern of key mechanism provides assure, efficient and improved way to increase the lifetime of the network.