A method and circuit are disclosed for generating an internal power voltage in a semiconductor memory device. An intermediate portion is positioned between the supercharger and a throttle valve. The present invention solves the technical problems that the prior pre-share-key based key management method is not suitable for larger networks and the PKI-based key management method is not suitable for wireless multi-hop networks; the public-key system and the ternary structure are adopted, thereby the security and the performance of the wireless multi-hop networks are improved. The server is configured not to reply the service information to the receiving terminal when determining that the ID information received from the receiving terminal is not justifiable.