eUICC eSIM Provisioning Stress Testing via Payload Replay
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Solution Overview
Problem
The existing methods for provisioning electronic Subscriber Identity Modules (eSIMs) on Universal Integrated Circuit Cards (UICCs) face challenges such as errors during authentication and provisioning, which can be difficult to detect and affect user experience, leading to inefficient testing processes that consume a large number of eSIMs and raise security concerns.
Innovation Solution
The proposed solution involves stress testing the eUICC operating system by capturing a payload from a live eSIM server and replaying it in subsequent test sessions, using a debug mode to bypass authentication and verification procedures, allowing the eUICC to regenerate ephemeral keys and decrypt the eSIM profile without consuming additional eSIMs from the inventory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If actual provisioning sessions are used to test eUICC OS, then testing accuracy is improved, but eSIM inventory is depleted
Solution Approach 1:
The patent creates a copy of the eSIM provisioning process by capturing the payload from a live eSIM server and replaying it in subsequent test sessions. This allows testing to be performed using captured data rather than consuming actual eSIMs from inventory, thereby maintaining testing accuracy while preserving eSIM resources
Solution Approach 2:
The patent performs preliminary capture of the provisioning payload during a live session before conducting repeated tests. By storing this captured payload for later replay, the system prepares test data in advance, eliminating the need to consume additional eSIMs during subsequent testing iterations
2Reliability
If authentication and verification procedures are performed during testing, then security is improved, but testing complexity increases
Solution Approach 1:
The patent introduces a debug mode as an intermediary mechanism that mediates between security requirements and testing needs. This debug mode allows the eUICC to bypass authentication and verification procedures specifically during testing operations, reducing testing complexity while maintaining security for normal provisioning operations
Solution Approach 2:
The patent makes the authentication behavior dynamic by enabling the eUICC to switch between normal mode (with full authentication) and debug mode (with bypassed authentication). This dynamic adjustment allows the system to adapt its security level based on whether it is performing actual provisioning or testing operations
3Reliability
If eSIM provisioning testing is performed repeatedly, then error detection is improved, but eSIM consumption increases
Solution Approach 1:
The patent enables repeated testing by creating copies of the provisioning payload and replaying them multiple times. This allows comprehensive error detection through repeated testing without consuming additional eSIMs, as the same captured payload can be reused indefinitely for testing purposes
Solution Approach 2:
The patent recovers and reuses the provisioning payload captured from the live server for multiple testing iterations. Instead of discarding the payload after a single use, the system recovers it for repeated replay, thereby eliminating eSIM consumption while maintaining the ability to detect errors through repeated testing
Data Source
AI summary
Provisioning of an electronic subscriber identity module (eSIM) to an embedded universal integrated circuit card (eUICC) is observed to acquire a captured payload. The captured payload is then used in replay test sessions. In a live test session, test equipment can be used to monitor the communication between an eSIM server and the eUICC in order to capture the payload transmitted from the eSIM server. In the live test session, the eUICC can be in a debug mode that persists an ability to generate the same keys. In the replay test sessions, the payload captured can be reused and the eUICC can regenerate the same keys to decrypt an encrypted eSIM in the payload. After an installation attempt, the eUICC can provide notifications to the test equipment. The eUICC can be stress-tested using methods described herein without consuming a large number of eSIMs from an eSIM server inventory.