On-Demand Secret Key Requesting for Sidelink Security
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Solution Overview
Problem
Wireless communications systems face challenges in managing secret keys for sidelink communications, as existing techniques are deficient in detecting key expiration and updating keys in a timely manner, leading to potential security breaches and delayed communications.
Innovation Solution
The implementation of on-demand secret key requesting and sharing methods, where user equipment (UE) can request updates to secret keys associated with sidelink channels, including identifiers for physical layer channels, allowing for immediate key refresh or security level upgrades, thereby ensuring continuous secure communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If secret keys are managed using traditional refresh timer mechanisms, then the system maintains simplicity in key management, but the secret key may expire before the refresh timer expires leading to security breaches and communication interruptions
Solution Approach 1:
The UE autonomously monitors the usage count of secret keys and detects when the usage threshold is reached, triggering automatic key update requests without requiring network entity intervention or complex centralized key management infrastructure
Solution Approach 2:
The system implements a feedback mechanism where the UE continuously monitors secret key usage status and provides updates to the network entity, enabling the network to respond dynamically with key refresh operations before security compromises occur
2Loss of energy
If the network entity is not notified of secret key expiration, then the signaling overhead is reduced, but the network entity cannot provide timely key updates resulting in security vulnerabilities
Solution Approach 1:
The UE performs preliminary monitoring of secret key usage status and proactively initiates key update requests before the key expires or is misused, allowing the network entity to maintain security awareness without continuous monitoring overhead
Solution Approach 2:
The UE acts as an intermediary that bridges the network entity and the secret key usage status, translating local key state information into network-coordinated key management actions without requiring the network entity to directly monitor all key usage details
3Ease of operation
If secret key updates are requested only after expiration, then the key management process is simpler, but communication security is compromised during the expiration period
Solution Approach 1:
The system replaces reactive key management (updating after expiration) with a proactive monitoring and updating mechanism based on usage count thresholds, substituting mechanical timing-based refresh with intelligent state-based triggering that prevents security breaches before they occur
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may transmit a request for an on-demand secret key to a network entity, such as if a secret key for a sidelink channel has expired before a refresh timer of the secret key expires. The UE may transmit a request for an update to a secret key associated with a first physical layer channel secured for sidelink communications based on the secret key being expired. The request may include an identifier of the first physical layer channel associated with the secret key. The UE may receive the update to the secret key based transmitting the request. In some cases, the UE may transmit an indication of the update to the secret key to a second UE.