Two-Tier Cryptographic Key System for Secure Data Sharing
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Solution Overview
Problem
Existing secure content distribution systems face limitations in controlling access and billing, particularly in environments requiring differentiated access and secure data sharing, as they often rely on cumbersome DRM implementations and key management systems that are not scalable or effective in protecting sensitive information.
Innovation Solution
A system utilizing layered, two-tier double cryptographic keys to create a closed cryptosystem for secure content distribution, where a first-tier key is publicly accessible within a secured walled region for network nodes registered to an authentication database, and a second-tier key is generated for further secured access, enabling step-wise controlled and billed data exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional DRM implementations and key management systems are used, then security control is provided, but system complexity and operational difficulty increase
Solution Approach 1:
The cryptographic key is divided into two separate tiers: a first-tier key for initial content encryption and distribution, and a second-tier key for subsequent access control. This segmentation allows the system to maintain strong security controls while simplifying key management operations, as each tier handles specific security functions rather than requiring a single complex key management system
Solution Approach 2:
The patent introduces an intermediary mechanism where the first-tier key serves as a bridge between public content distribution and private second-tier key access. This intermediary layer enables secure content sharing without requiring direct implementation of complex traditional DRM systems, as the two-tier structure mediates between security requirements and operational simplicity
2Reliability
If traditional key management systems are used, then access control is provided, but scalability and effectiveness in protecting sensitive information decrease
Solution Approach 1:
The two-tier cryptographic system is designed to be universally applicable across multiple platforms and content types. The first-tier key enables broad content distribution while the second-tier key provides universal access control mechanisms that can be implemented across different devices and systems, enhancing scalability without compromising access control effectiveness
Solution Approach 2:
The patent adds a dimensional layer to key management by introducing the second-tier key structure. This dimensional change allows the system to scale effectively, as the hierarchical key structure can accommodate growing numbers of users and content types without requiring fundamental changes to the access control mechanism
3Ease of operation
If usernames and passwords are used for authentication, then access control is provided, but security effectiveness decreases due to forgotten or compromised credentials
Solution Approach 1:
The patent replaces the mechanical authentication system (usernames and passwords) with a cryptographic key-based system. Instead of relying on human-remembered credentials, the system uses machine-managed cryptographic keys that cannot be forgotten or easily compromised, thereby maintaining ease of operation while significantly improving security effectiveness
4Productivity
If symmetric keys are used for encryption, then encryption efficiency is improved, but key distribution and storage security worsen
Solution Approach 1:
The encryption system is segmented into two key tiers where the first-tier symmetric key handles efficient content encryption, while the second-tier key manages secure distribution and storage. This segmentation allows the system to maintain encryption efficiency while simplifying key distribution, as the hierarchical structure separates the computational efficiency requirements from the security-sensitive distribution requirements
Data Source
AI summary
A system based on layered, two-tier double cryptographic keys providing a closed cryptosystem within a secured network environment, the system including a digital key management device and a network node. The digital key management device generates a first-tier cryptographic key, a second-tier cryptographic key and makes the first-tier and second-tier cryptographic keys publicly accessible within a first and a second secured walled regions that are accessible to a network node registered to a first authentication database associated with an access server of the system, encrypts a first and second content with the first-tier and second-tier cryptographic keys, and generates encrypted first and second content. The network node requests access to the first secured walled region, accesses the first-tier and the second-tier cryptographic keys, decrypts the first and second content, generates first and second data containers based on the decrypted content, and transfers the data containers to a client device.