eUICC Binding Applet Prevents Unauthorized Operation
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Solution Overview
Problem
Existing device-eUICC binding solutions are not secure and are limited in their applicability across different use cases, as they often require a trusted execution environment (TEE) and are not flexible enough to accommodate varying security and performance capabilities of different devices.
Innovation Solution
A device-eUICC binding solution that utilizes an issuer security domain root (ISD-R) with a binding applet, which sets the eUICC to a disabled state after each reset and only enables it when valid enablement information from a target device is received, ensuring secure operation and broad applicability across various use cases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing device-eUICC binding solutions use a trusted execution environment (TEE) for security, then security is improved, but device complexity and applicability across different device types deteriorate
Solution Approach 1:
The patent extracts the binding verification functionality from the device TEE and relocates it to the eUICC itself. The eUICC now independently performs binding verification using its own security domain (ISD-R) and binding applet, eliminating the need for device TEE involvement. This resolves the contradiction by maintaining security through eUICC-based verification while reducing device complexity requirements.
Solution Approach 2:
The patent introduces a binding applet in the eUICC as an intermediary that mediates between the device and the profile management system. This binding applet handles the verification of enablement information and binding tokens, serving as a self-contained security mechanism that doesn't require external TEE infrastructure, thus improving applicability across different device types.
2Reliability
If existing binding solutions are designed for specific device types, then security is improved, but adaptability across different use cases deteriorates
Solution Approach 1:
The patent implements a universal binding mechanism in the eUICC that can be applied across all device types (smartphones, tablets, IoT devices, automotive devices). The binding applet in the ISD-R provides a standardized interface for binding verification that works regardless of the host device's capabilities, enabling the same eUICC to securely operate in diverse device environments.
Solution Approach 2:
The patent changes the binding verification parameters from device-specific TEE configurations to eUICC-based binding tokens and enablement information. This parameter change allows the binding mechanism to be independent of device type, enabling the same security approach to be applied universally across consumer devices, IoT devices, and other platforms with varying security capabilities.
3Ease of operation
If the eUICC remains enabled after reset for convenience, then ease of operation is improved, but security deteriorates
Solution Approach 1:
The patent implements preliminary binding verification action immediately after eUICC reset. The binding applet automatically checks whether the device is authorized through enablement information verification before allowing any profile operations. This preliminary security check ensures that convenience is not compromised, as the verification happens automatically without requiring user intervention, while maintaining high security standards.
Solution Approach 2:
The patent implements a feedback mechanism where the binding applet continuously monitors device authorization status. After reset, the eUICC enters a restricted state and only transitions to an enabled state after receiving valid enablement information from the device. This feedback loop ensures that security is maintained while allowing operational convenience once authorization is confirmed.
Data Source
AI summary
Systems, methods, and devices are provided with an Embedded Universal Integrated Circuit Card (eUICC). The eUICC includes a device-eUICC binding applet being implemented in an issuer security domain root (ISD-R). The device-eUICC binding applet is constructed to, after each reset of the eUICC, effect the eUICC to be in a disabled state which prevents operation of the eUICC in the device.