Key Derivation System Using Security State for Content Access
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Solution Overview
Problem
Existing content delivery systems face challenges in ensuring secure key derivation for encrypted content, particularly in preventing unauthorized access and administrative or manufacturing errors, which can compromise security settings.
Innovation Solution
A system that utilizes a device's security configuration and key derivation logic to generate content keys based on hardware-specific security settings, ensuring proper implementation and preventing unauthorized decryption by using a secure memory and processor to derive keys from pre-stored security information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional key derivation methods are used, then content delivery can be achieved, but security against unauthorized access and administrative errors cannot be ensured
Solution Approach 1:
The system performs preliminary actions by deriving a security key before content decryption is allowed. The key derivation process checks security settings in advance and only proceeds if the device is properly configured, preventing unauthorized access before it can occur. This preliminary key derivation based on security configuration ensures that only properly configured devices can access content.
Solution Approach 2:
The system implements feedback by using the derived security key to verify and control subsequent content decryption operations. The key derivation process receives feedback about the device's security settings and adjusts the key generation accordingly, ensuring that content can only be decrypted if the security configuration is correct, thereby preventing administrative and manufacturing errors from compromising security.
2Reliability
If security keys are used for content delivery, then unauthorized access is prevented, but the system becomes more complex
Solution Approach 1:
The key derivation system achieves universality by using a single derived security key for multiple purposes: verifying device security configuration, controlling content decryption, and preventing unauthorized access. This multi-functional approach consolidates what would otherwise be separate security mechanisms into one unified system, reducing overall complexity while maintaining strong security.
Solution Approach 2:
The derived security key acts as an intermediary between the content encryption system and the decryption process. It mediates by verifying security settings before allowing decryption to proceed, thereby simplifying the overall system architecture by introducing a single security checkpoint rather than multiple separate verification mechanisms.
3Ease of operation
If security settings are not verified, then device operation is simpler, but key generation can be compromised by administrative or manufacturing errors
Solution Approach 1:
The system performs preliminary verification of security settings during the key derivation process before content decryption is allowed. This preliminary action checks that the device is properly configured and only proceeds with key generation if the security settings are correct, preventing administrative or manufacturing errors from compromising key security while maintaining simple device operation for authorized users.
Data Source
AI summary
A device generates a content key that depends upon device security state information. For example, the device may retrieve a first content key and a security state, and then derive a content key using the first content key and the security state. Accordingly, if the security state is incorrect, then the generated content key is incorrect, and the device cannot decrypt content provided to the device.