Physical Channel Encryption Using UE-Specific Secret Keys
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Solution Overview
Problem
Current wireless communication systems lack robust encryption of physical channels at the physical layer, making them vulnerable to eavesdropping and security breaches, especially in IoT environments where many devices are interconnected.
Innovation Solution
Implementing a method where user equipment (UE) and base stations determine a UE-specific secret key using a key derivation function and physical layer parameters to encrypt unicast physical channels, ensuring secure transmissions between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical channels are transmitted without encryption at the physical layer, then system complexity and processing overhead are reduced, but security against eavesdropping and unauthorized access deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-generating and storing secret keys in both the UE and base station before actual communication occurs. The key derivation function is prepared in advance, and when encryption is needed, the system can quickly retrieve and apply the pre-computed key rather than performing complex key generation during transmission, thus enhancing security without significantly increasing real-time processing complexity
Solution Approach 2:
The patent introduces a key derivation function as an intermediary mechanism that transforms physical layer parameters into secret keys. This intermediary layer enables secure encryption without requiring the systems to directly share complex cryptographic keys, as the KDF mediates the key generation process using readily available physical parameters, thereby balancing security requirements with system complexity constraints
2Reliability
If UE-specific secret keys are generated using key derivation functions, then encryption security is improved, but computational overhead and processing time increase
Solution Approach 1:
The patent applies self-service by enabling both the UE and base station to independently generate identical secret keys using the key derivation function and shared physical layer parameters. Each system performs the key derivation autonomously without requiring key exchange or coordination protocols, eliminating time-consuming key distribution processes while maintaining strong encryption security
Solution Approach 2:
The patent utilizes parameter changes by deriving secret keys from dynamic physical layer parameters such as channel conditions, timing information, and frequency offsets. These parameters naturally change over time and vary between UE-base station pairs, allowing the system to generate unique, time-varying encryption keys without requiring complex key management infrastructure, thus reducing processing time while enhancing security
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine, based at least in part on a key derivation function and a set of physical layer parameters, a secret key for encrypting a unicast physical channel at a physical layer, wherein the secret key is a UE-specific secret key. The UE may transmit, to a base station, an encrypted transmission over the unicast physical channel based at least in part on the secret key. Numerous other aspects are described.