Abstract: This invention involves an encryption method that is mainly applied to network. The network could be both wireless or wired, the former is connected through a wireless router, and the latter is connected through a router. When the network receives a message requesting connection from at least one new networking device, it can authenticate and authorize the message through the key to form a fixed connection with the network, and at the same time, at least one connected device to the network can update the password connected to the network synchronously, or at least one connected device connected to the network can update the password connected to the network at any time, so as to improve the performance of network security and avoid hacking.