Network encryption methods for realizing encryption of local area networks at the bottom layer driver of network cards of embedded devices

A network encryption method for realizing encryption of a local area network at the bottom layer driver of a network card of an embedded device, comprising the following steps:

• Step 1. writing an encryption protocol on a network card driver of a master device, which is used to perform management of the encryption protocol and encryption of network data;
• Step 2. initiating a thread by the master device after the network card driver is loaded to the master device, and sending an identification package at certain intervals, which mainly comprises an encryption method, an encrypted key and encryption level;
• Step 3. receiving the identification package from the master device by a slave device after the network card driver is loaded to the slave device, and obtaining a real secret key after resolving the identification package according to the encryption method, the encrypted key and the encryption level in the identification package, so as to perform encryption on receiving and sending data by and from the slave device according to the real secret key;
• Step 4. hooking out the network data by the network card driver through hook function when sending data to the hardware layer, during sending network data from the network card driver of the master device or the slave device, and then performing encryption on the specific data by using a real encrypted secret key obtained from an algorithm according to the encrypted key and the encryption level and sending the encrypted network data to a specified network card after completing encryption, during receiving the network data from the hardware layer of the master device or slave device, hooking out the data by the network card driver through the hook function and then performing decryption on the data by using a real secret key obtained from an algorithm according to the encrypted key and the encryption level, and sending the decrypted data to the network layer to achieve encryption and decryption of receiving and sending the network data.