SYSTÈME DE RÉUTILISATION, DISPOSITIF DE CRÉATION DE CLÉ, DISPOSITIF DE SÉCURITÉ DE DONNÉES, ORDINATEUR EMBARQUÉ, PROCÉDÉ DE RÉUTILISATION ET PROGRAMME INFORMATIQUE

摘要

A reuse system includes: a key generation device; an in-vehicle computer that is detached from a first vehicle and is installed in a second vehicle; and a data security device that is installed in the second vehicle. The key generation device includes a vehicle interface, and a key generation unit that generates a first key that is the same as a key stored in the in-vehicle computer from a time when being installed in the first vehicle by using an in-vehicle computer identifier, and a master key that is common to the first and second vehicles, and transmits the first key to the second vehicle. The data security device includes a first interface unit, and a first cryptographic processing unit that encrypts first data, which is applied to the in-vehicle computer, with the first key to generate encrypted first data, and transmits the encrypted first data to the in-vehicle computer. The in-vehicle computer includes a second interface unit, a second storage unit that stores the first key from a time when being installed in the first vehicle, and a second cryptographic processing unit that decrypts the encrypted first data with the first key.