Cryptographic Ratcheting for Expiring Timestamp Keys
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Solution Overview
Problem
Managing the security of computing resources by ensuring proper authentication and secure access while maintaining the expiration of secured resources is complex and resource-intensive, especially as organizations grow in size and complexity.
Innovation Solution
A cryptographic ratcheting structure is used to generate and manage timestamp keys that expire after a specified time, ensuring data remains inaccessible after the expiration time by utilizing a key management system that includes a network of Hardware Security Modules (HSMs) and a coordinator to derive and destroy keys accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional key management methods are used to secure computing resources for specific periods, then security control is achieved, but the complexity and resource requirements increase significantly as organizations grow
Solution Approach 1:
The patent segments key management into hierarchical levels (root keys, intermediate keys, leaf keys) and temporal intervals (time buckets). Each level handles specific time ranges, allowing parallel management of multiple expiration schedules without centralized complexity. This segmentation enables independent management of different resource groups with different expiration requirements.
Solution Approach 2:
The system pre-generates keys for future time intervals and stores them in advance within time buckets. When a resource needs expiration protection, the appropriate pre-generated key is immediately available without real-time computation. This preliminary key generation eliminates runtime complexity and ensures consistent expiration enforcement.
2Reliability
If manual key management processes are implemented to maintain expiration of secured resources, then access control is enforced, but significant resources and effort are required
Solution Approach 1:
The key management system operates autonomously through automated key generation, rotation, and destruction processes. The hierarchical structure automatically selects and applies appropriate keys based on resource expiration metadata without human intervention. This self-service mechanism eliminates manual key management overhead while maintaining strict access control enforcement.
Solution Approach 2:
The patent creates a universal key management framework that handles multiple expiration scenarios, resource types, and time intervals through a single system. The same hierarchical key structure serves diverse organizational needs from short-term access to long-term archival, eliminating the need for separate manual processes for different resource groups.
3Reliability
If encryption keys are maintained indefinitely for security purposes, then data protection is ensured, but the ability to enforce expiration and control unauthorized access is compromised
Solution Approach 1:
The key management system is inherently dynamic, with keys automatically expiring according to their associated time buckets. The hierarchical structure allows keys to be generated, activated, and destroyed based on temporal conditions rather than static lifetime. This dynamic approach enables data protection that automatically adapts to expiration requirements without compromising security.
Solution Approach 2:
The system implements periodic key rotation and expiration based on predetermined time intervals represented by time buckets. Keys are systematically renewed and retired in regular cycles, ensuring that data protection mechanisms automatically enforce expiration policies. This periodic action maintains security while enabling controlled access termination.
Data Source
AI summary
Techniques described herein enhance information security in contexts that utilize key management systems and cryptographic keys. A cryptographic structure is utilized to maintain cryptographic keys with associated expiration times such that after an expiration time associated with a cryptographic key has passed, the cryptographic key is no longer accessible.