SD Card Permission Control via Host Authorization
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Solution Overview
Problem
The high convenience of SD memory cards makes them vulnerable to unauthorized data leakage, and existing countermeasures complicate settings for users, limiting device compatibility and increasing usage restrictions.
Innovation Solution
An electronic device system that includes a storage device and an electronic device connected via an SD interface, where the electronic device sends permission/inhibition information to the storage device, allowing it to switch data access permissions, ensuring only authorized devices can read data, without limiting OS types or complicating user settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If SD memory cards are made universally compatible and easy to use, then ease of operation and adaptability improve, but security against unauthorized data leakage deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-registering permission information in the electronic device before data access occurs. When a storage device is connected, the electronic device already has the authorization data stored, allowing immediate verification without requiring user input or complex settings during operation. This resolves the contradiction by maintaining ease of use while preventing unauthorized access through advance security configuration.
Solution Approach 2:
The storage device performs self-service security verification by automatically checking permission information from the electronic device and controlling its own data access. The storage device's control unit autonomously determines whether to permit reading based on the verification result, without requiring user intervention. This maintains universal compatibility while preventing unauthorized data leakage through automated security enforcement.
2Object-affected harmful factors
If special software is stored in SD memory card to prevent unauthorized access, then security improves, but device complexity and ease of operation worsen
Solution Approach 1:
The patent inverts the conventional approach by storing permission information in the electronic device (host) rather than in the storage device itself. Instead of the storage device containing security software and verification logic, the electronic device holds the permission information and the storage device performs simple verification. This inversion reduces the complexity of the storage device while maintaining security, and eliminates the need for complicated user settings.
3Object-affected harmful factors
If permission verification is implemented to prevent unauthorized access, then security improves, but adaptability and ease of operation worsen
Solution Approach 1:
The patent applies parameter changes by using a simplified permission verification mechanism that changes the state of the storage device's data access capability based on verification results. The control unit switches between a state where data reading is permitted and a state where it is inhibited, based on the permission information. This binary state change provides effective security control without requiring complex configurations, maintaining compatibility across different electronic devices while preventing unauthorized access.
Data Source
AI summary
When an SD card is connected to an SD socket of an electronic device, a control unit of the SD card obtains permission/inhibition information (an output signal) outputted from a setting unit of the electronic device. Based on the obtained permission/inhibition information, the control unit starts the operation of a DC-DC converter corresponding to a memory unit from which reading-out of data is permitted. By virtue of this, reading-out of data from the memory unit is achieved in correspondence to the permission/inhibition information.