Radio sensor access control method based on key chain

The invention is based on five highly-effective sensor network access control modes: which are one-way key chain access control, multi key chain access control, Merkle tree-based access control, expanded Merkle tree access control, and an mode of canceling the key chain of captured users with Merkle. The method uses said five access control modes to reduce the storage expense of sensor node and increase the flexibility and expandability of access control so as to support mass users to access network. The invention is compatible with current sensor network data broadcast protocol.