Deterministic Identifier Encryption for Low-Memory Peer Communication

The patent extracts the public key dependency from traditional PKI by using a centralized master public key Kmaster that is shared among all devices. Each device only needs to store this single master public key instead of multiple individual public keys, thereby reducing memory storage requirements while maintaining communication security through the hierarchical deterministic key derivation system

The master public key Kmaster serves multiple functions: it is used to derive child public keys for different devices, verify identities, and enable secure communication. This universal key structure eliminates the need for each device to store and manage multiple separate public keys, addressing the memory storage issue while preserving security

The patent segments the centralized IBE model by introducing a hierarchical deterministic structure where a master private key kmaster generates child private keys kmaster, j through a deterministic derivation function. This segmentation allows distributed key generation without requiring a centralized authority to manage individual device keys, thereby maintaining security while reducing memory requirements

The system enables self-service key generation where child private keys are deterministically derived from the master private key using a shared seed and derivation function. Each device can independently generate its own child key pair without requiring a centralized trusted authority to issue keys, eliminating the security compromise while maintaining the memory storage benefit