This section will mainly analyze the development of digital key industry in network security and data security of Intelligent Connected Vehicles（ICVs）. Firstly，this section introduces the basic situation of digital key. Starting from the development process of remote key，due to the development and popularity of smart phones in recent years，it is becoming a natural development trend of digital key. Then it describes the development trend of digital key，mainly introduces the advantages of Bluetooth transmission technology and future application scenarios. Digital keys also have security risks：near-field communication security risk，mobile APP security risk，4G/5G threat risk，etc. Finally，several security cases of digital keys are introduced. There are Honda Civic key attack，in which the synchronous counter of the rolling code can be rolled back to cause the expired open door command can be restored，Tesla digital key attack，in which the relevant security researchers found that the PKES system of Tesla Model S，The Challenge Response Authentication Protocol can be attacked due to its very small key space and weak two-way authentication，and thieves can steal vehicle valuables through relay attacks.