Host Device Terminal Identification Erasure Protocol
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Solution Overview
Problem
Information from users, such as account details and browsing history, often remains in terminal devices after a SIM card is removed, leading to incomplete erasure and potential security issues during device changes.
Innovation Solution
A communication system comprising a host device and terminal devices, where the host device manages terminal identification and user information to ensure complete erasure of user data by transmitting specific instructions for information erasure when a terminal device is replaced.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If user performs manual erasure processing before removing SIM card, then user information can be erased from terminal device, but erasure may be incomplete due to inappropriate processing
Solution Approach 1:
The terminal device automatically performs erasure processing of user information without requiring manual user intervention. The device detects SIM card removal and autonomously executes the erasure of account information, calling history, and browser cache, eliminating the need for users to perform potentially incorrect manual erasure operations.
Solution Approach 2:
The system introduces a communication procedure as an intermediary mechanism between SIM card removal and information erasure. This automated communication-based approach serves as a reliable mediator that ensures complete erasure without the uncertainties of manual user operations.
2Extent of automation
If communication procedure is used to erase user information, then automated erasure is achieved, but erasure may be incomplete due to communication troubles
Solution Approach 1:
The terminal device performs erasure processing of user information immediately upon detecting SIM card removal, before any potential communication troubles can occur. This preliminary action ensures that information is erased at the moment of device change, eliminating the risk of incomplete erasure due to subsequent communication failures.
Solution Approach 2:
The terminal device autonomously detects SIM card removal and automatically executes erasure processing without requiring communication with external systems. This self-service approach eliminates dependency on communication procedures, ensuring reliable and complete erasure regardless of communication status.
3Ease of operation
If user information is not completely erased, then device change is convenient, but security risks and privacy issues arise
Solution Approach 1:
The terminal device automatically performs complete erasure of user information upon detecting SIM card removal, without requiring any additional user actions. This self-service mechanism ensures both convenience (no manual erasure needed) and security (complete automated erasure), eliminating the trade-off between ease of operation and security.
Solution Approach 2:
The system implements a feedback mechanism where the terminal device continuously monitors SIM card status and automatically triggers erasure processing when removal is detected. This closed-loop feedback ensures that erasure is consistently performed at the appropriate moment, maintaining both convenience and security during device changes.
Data Source
AI summary
When terminal identification information TI of one terminal device used by a user among two or more terminal devices is newly stored in a memory of a host device together with user identification information UI (S3a), an examination part examines, in the memory of the host device, a presence or absence of terminal identification information (terminal identification information TI-p) corresponding to the user identification information UI, excluding terminal identification information TI and terminal identification information corresponding to a terminal device that is currently used by the user (S11). When the terminal identification information TI-p exists, a management part performs control to transmit predetermined instruction information together with the terminal identification information TI-p to the two or more terminal devices (S12). When the terminal identification information TI-p received together with the instruction information from the host device matches own terminal identification information, an information erasure part erases information on a user other than the user who is currently stored in own memory (S13).