Broadcast Encryption Key Generation Using Node Secrets and Instant Keys
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Solution Overview
Problem
Current broadcast encryption systems face inefficiencies in key management and update, particularly in handling revoked users, leading to high communication and operation overhead, limited revocation capabilities, and potential accidental revocation of innocent devices.
Innovation Solution
An apparatus and method that generate node keys by combining a fixed node secret and a variable instant key, where the node secret remains unchanged and the instant key is periodically updated, reducing the need for complex key updates and minimizing transmission overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional broadcast encryption key management is used, then encryption security is maintained, but key update complexity and communication overhead increase significantly when revoked users occur
Solution Approach 1:
The key management system is segmented into two independent parts: a long-term master key for encryption and a short-term session key for user-specific access. This segmentation allows the master key to remain stable while session keys are frequently updated and revoked, reducing the complexity of key management operations.
Solution Approach 2:
The system implements dynamic key assignment where session keys are generated and revoked based on user status. Authorized users receive current session keys while revoked users are automatically excluded. This dynamic mechanism maintains security without requiring complex manual key updates for each user.
2Reliability
If frequent key updates are performed to handle revoked users, then security is maintained, but communication overhead and transmission time increase
Solution Approach 1:
The system performs key updates periodically based on user status changes rather than continuously. Session keys are updated only when users are added or revoked, and the master key is updated at longer intervals. This periodic action maintains security while minimizing communication overhead and update time.
3Adaptability or versatility
If comprehensive key management is implemented for all users, then user access control is improved, but the risk of accidental revocation of innocent devices increases
Solution Approach 1:
The system extracts user-specific session keys from the master key for individual user management. Each authorized user receives a unique session key that is independent of other users' keys. This extraction allows precise control over individual user access without affecting other users, eliminating the risk of accidental revocation.
4Ease of manufacture
If traditional key generation methods are used, then encryption capability is provided, but key management burden and operational complexity increase
Solution Approach 1:
The system implements self-service key management where authorized users automatically receive and use session keys without manual intervention. The key distribution system automatically identifies authorized users and provides them with current session keys, eliminating the need for manual key management operations and reducing operational complexity.
Data Source
AI summary
An apparatus and method for generating a key for a broadcast encryption. The apparatus includes a node secret generator for managing a user that receives broadcast data in a tree structure and for generating a unique node secret for each node in the tree structure. The apparatus also includes an instant key generator for temporarily generating an instant key used at all nodes in common in the tree structure, and a node key generator for generating a node key for each node by operating the node secret generated at the node secret generator and the instant key generated at the instant key generator. Thus, key update can be efficiently achieved.