IoT Encrypted Communication Using Device Identity Key Derivation

The patent extracts and eliminates the centralized PKI infrastructure (certificate authorities, key distribution centers) from the encryption system. Instead of relying on external trusted third parties, each device independently generates its own identity key pair and derives shared encryption keys through direct peer-to-peer key derivation functions using publicly available device identifiers, thereby removing the complex centralized management layer while maintaining security

Each device autonomously generates its own cryptographic identity (private key and public key) and independently derives shared encryption keys with other devices using only the other device's public key and its own private key through a key derivation function. This self-service approach eliminates the need for external key distribution infrastructure and reduces system complexity

The patent removes the computationally intensive PKI operations (certificate verification, public key infrastructure interactions) from the communication flow and replaces them with lightweight key derivation functions that operate directly between peer devices, significantly reducing the computational burden and power consumption required for secure communication

The patent changes the cryptographic approach from asymmetric key exchange requiring complex mathematical operations to symmetric key derivation using simpler computational functions. The key derivation function processes device identifiers and public keys to generate shared secrets with lower computational complexity, thereby reducing power consumption while maintaining security

The patent segments the centralized key management function into distributed autonomous key generation and derivation operations at each device. Instead of a single centralized authority managing all keys, each device independently manages its own identity keys and derives shared keys with peers, enabling the system to scale to billions of nodes without requiring centralized coordination

The patent creates a universal key derivation mechanism that works across all device types and scales indefinitely. The same key derivation function can be applied to any pair of devices using their public keys and device identifiers, providing a scalable solution that adapts to any number of nodes in the IoT network without requiring additional infrastructure

The patent implements periodic key renewal by regenerating encryption keys at predetermined intervals or after a certain amount of data has been encrypted. The key derivation function is re-executed with updated inputs (such as time-based counters or fresh random values) to produce new shared secrets, ensuring that even if one key is compromised, the damage is limited to a specific time window

The patent makes the encryption keys dynamic rather than static by continuously regenerating them based on changing inputs to the key derivation function. This could include time-based parameters, data volume counters, or periodic re-exchange of public keys, ensuring that keys evolve over time and cannot be reverse-engineered from long-term observation of encrypted traffic