Mobile Device SIM Authentication Locking Mechanism
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Solution Overview
Problem
Existing methods for securing mobile devices are inadequate, as they fail to effectively lock devices when they cannot connect to a service network or when a fake subscriber identity card is used, potentially leading to exposure of private and important information.
Innovation Solution
A mobile communication device and method that initially locks upon power-on, determining the authenticity of the subscriber identity card by checking a challenge response and performing an attach procedure with the service network, allowing unlocking only if the attach is successful.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the device is locked upon power-on with traditional methods (sending encrypted messages or detecting SIM card removal), then basic security is provided, but the device cannot be locked if network connection is unavailable or if a fake SIM card is used
Solution Approach 1:
The device performs preliminary authentication actions during the network attach procedure before allowing access. The processing unit verifies the SIM card's authenticity by checking challenge-response pairs and confirms successful network attachment before unlocking the device, ensuring security measures are in place before the device becomes accessible
Solution Approach 2:
The system implements feedback mechanisms where the processing unit continuously monitors network attach status and SIM card authentication results. Based on this feedback, the device dynamically adjusts its locked state - remaining locked if authentication fails or network attach is unsuccessful, and only unlocking when both verification steps confirm legitimacy
2Object-affected harmful factors
If the device remains locked until successful network attach and SIM authentication, then unauthorized access is prevented, but legitimate users experience delayed access
Solution Approach 1:
The authentication and network attach procedures are performed as preliminary actions during device initialization. Once these checks are complete and successful, the device transitions from locked to unlocked state automatically, minimizing the time legitimate users wait for access while maintaining security during the verification process
3Ease of manufacture
If traditional locking methods are used, then implementation is simple, but they fail when network connection is unavailable or fake SIM cards are detected
Solution Approach 1:
The device performs self-verification by autonomously checking SIM card authenticity through challenge-response authentication and confirming network attach status without requiring external intervention. The processing unit independently determines whether to maintain or remove the locked state based on these self-conducted verification procedures
Solution Approach 2:
The device performs preliminary authentication actions during the network attach procedure before allowing access. The processing unit verifies the SIM card's authenticity by checking challenge-response pairs and confirms successful network attachment before unlocking the device, ensuring security measures are in place before the device becomes accessible
Data Source
Figure 1
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Figure 3A
AI summary
A mobile communication device (110) initially configured to enter a locked state upon being powered on is provided. The mobile communication device includes a wireless communication unit (20) and a processing unit (40). The wireless communication unit performs wireless transmission and reception to and from a service network (120). The processing unit (40) determines whether a subscriber identity card coupled in the mobile communication device is authentic, by checking a challenge response received from the subscriber identity card, and performs an attach procedure with the service network via the wireless communication unit in response to the subscriber identity card being authentic. Also, the processing unit allows the mobile communication device to enter an unlocked stated from the locked state in response to the attach procedure being successful.