SIM Removal Detection and Secure Alarm Transmission
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Solution Overview
Problem
The removal of a SIM card from a communications device poses a significant security risk to the communications network, as it can be used by an attacker to access the network and perform man-in-the-middle attacks.
Innovation Solution
A communication method and apparatus that detect the removal of a SIM card and send alarm information to a network device, where the alarm information is secured based on stored security context, allowing the network to take targeted measures to mitigate potential security risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If SIM card removal is allowed for device flexibility, then ease of operation is improved, but security of the communications network deteriorates
Solution Approach 1:
The system performs preliminary actions by establishing security context and device-SIM binding relationships before SIM card removal occurs. The network device stores binding information between the device identifier and SIM card identifier in advance, and the communications device stores security context including cryptographic keys. When SIM removal is detected, these pre-established bindings enable immediate security response, allowing flexible SIM removal while maintaining network security through pre-configured authentication mechanisms.
2Reliability
If SIM card removal detection and alarm mechanisms are implemented, then network security is improved, but device complexity increases
Solution Approach 1:
The communications device performs self-service by autonomously detecting SIM card removal through monitoring SIM card identifiers and comparing them with stored binding information. The device automatically generates alarm information containing device identifier, SIM card identifier, and cause value, and sends this information to the network device without requiring external detection systems. This self-service approach improves network security while minimizing additional device complexity by utilizing existing communication and processing capabilities.
Data Source
AI summary
Embodiments of this application provide example communication methods and apparatuses. One example communication method is applied to a communications device, where a subscriber identification module (SIM) card is installed in the communications device, and where the example communication method includes determining, by the communications device, that the SIM card is removed. The communications device can then send alarm information to a network device, where the alarm information indicates that the SIM card in the communications device is removed, and where security protection is performed on the alarm information based on security context stored in the communications device. The communications device can then delete the security context.