Tamper-Resistant Key Generation for Vehicle Cryptographic Communication

The patent extracts the key management function from external servers and embeds it directly into each device through tamper-resistant key generation functions. Each device independently generates and manages its own keys and keyrings, eliminating the need for external key distribution infrastructure while maintaining security through distributed key management.

Each device performs self-service key management by autonomously generating keys, creating keyrings, and managing cryptographic materials without requiring external key management servers. The device uses its embedded key generation function and stored individual information to independently establish secure communication channels.

The patent segments the key structure into hierarchical components: master keys, key generation functions, and individual keyrings. Each device stores a compact set of cryptographic materials including individual information and a keyring with a limited number of public keys, rather than storing complete key pairs for all possible communication targets. This segmentation reduces data quantity while maintaining security through structured key management.

The key generation function serves multiple purposes: generating initial keys, deriving keyrings, and enabling secure communication with any device that has the corresponding individual information. This multi-functional approach eliminates the need to pre-store keys for all potential communication targets, reducing the amount of data required while maintaining the ability to communicate securely with any device in the network.