In order to improve the network security protection level of the Internet of vehicles technology and ensure the security of the Internet of vehicles system，it is necessary to use cryptography to realize the identity authentication，secure communication and data security protection of the internet of vehicles system. This section first introduces the application scenarios of automotive keyology，including communication encryption，information verification，identity authentication，and digital certificates. Secondly，the typical encryption algorithm implementation technology，national secret algorithm，and international algorithm are introduced. This paper describes the key lifecycle management，including key issuance，key storage，and key update. Finally，the requirements and restrictions of the on-board network on the security mechanism are analyzed，the key allocation methods of the vehicle’s internal network are summarized，and the characteristics of the encryption communication method between ECUs are analyzed.