Provisioning Server Key Segmentation for Secure Authentication
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Solution Overview
Problem
Existing methods for client devices to securely authenticate and bind sensitive data to specific devices are complex, especially when using symmetric secrets, and are challenging to maintain in public cloud environments, where large lists of symmetric secrets are difficult to secure and manage.
Innovation Solution
A method involving a dedicated provisioning server that manages symmetric secrets, providing unique operator-specific device secrets to client devices, which are then used by license servers to deliver licenses for consuming protected multimedia content, ensuring key segmentation and easy operation with reduced sensitive data in the cloud.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If symmetric secrets are used for client device authentication and data binding, then strong authentication and data binding are achieved, but the system complexity and difficulty of maintenance increase significantly
Solution Approach 1:
The patent introduces a dedicated provisioning server as an intermediary between the operator and client devices. This server manages the symmetric secrets and handles key distribution, thereby reducing the complexity burden from the client devices while maintaining strong authentication capabilities. The provisioning server acts as a centralized authority that simplifies the overall system architecture.
Solution Approach 2:
The patent extracts the complex symmetric secret management functionality from the client devices and relocates it to a dedicated provisioning server. This extraction removes the maintenance burden and complexity from the client devices while preserving the authentication strength provided by symmetric secrets.
2Reliability
If large lists of symmetric secrets are deployed on servers, then strong authentication is maintained, but security risks and management difficulty increase in public cloud environments
Solution Approach 1:
The patent segments the symmetric secrets into operator-specific device secrets, with each secret being unique to a particular operator and client device combination. This segmentation reduces the attack surface and limits the impact of potential compromises. Instead of managing large lists of secrets, the system manages individualized secrets that are provisioned on-demand.
Solution Approach 2:
The provisioning server acts as a secure intermediary that manages symmetric secrets in a controlled environment. Rather than deploying large lists of secrets directly to public cloud servers, the provisioning server mediates the key distribution process, reducing security risks associated with public cloud deployments.
3Adaptability or versatility
If operator-specific unique device secrets are provisioned to each client device, then key segmentation between operators is achieved, but the provisioning process becomes more complex
Solution Approach 1:
The provisioning server provides a universal interface for provisioning operator-specific secrets to client devices. This single server handles multiple operators and multiple devices, providing a multi-functional solution that achieves key segmentation without requiring separate provisioning systems for each operator.
Solution Approach 2:
The system enables automated self-service provisioning where the provisioning server automatically generates and distributes operator-specific device secrets to client devices based on device identifiers and operator information. This automation reduces the manual complexity of provisioning while maintaining proper key segmentation.
Data Source
AI summary
A method for securely receiving a multimedia content by a client device operated by one or more operator(s) involving a dedicated provisioning server of a security provider managing symmetric secrets used by the client devices and operators license servers. The provisioning server provides to the client device one or more generations of operator specific unique device secrets, which are then exploited by the various operators' license servers to deliver licenses such that authorized client devices can consume protected multimedia contents.