Portable Storage Mode Switching for Data Security
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Solution Overview
Problem
Portable auxiliary storage devices, such as memory cards, lack a flexible data protection mechanism that allows users to selectively enable or disable security features, leading to usability issues when important data is stored, as existing solutions either restrict access for the user as well as unauthorized individuals or require carrying multiple cards.
Innovation Solution
A portable auxiliary storage device that allows users to switch between a data protection mode and a normal mode, where the data protection mode restricts access after a set time and can be overridden with a password, while the normal mode permits unrestricted access, enhancing versatility by enabling use classification in a single device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data protection function is always enabled in portable auxiliary storage device, then security against third person access is improved, but usability for the possessor is significantly damaged
Solution Approach 1:
The memory card enables dynamic switching between data protection mode and normal mode through a mode setting section. The mode can be changed based on the storage content and usage scenario, allowing the system to adapt its security level rather than maintaining a fixed protection state. This resolves the contradiction by making security flexible rather than static.
Solution Approach 2:
The invention changes the operational parameter of the memory card from a single fixed state to multiple selectable modes. By introducing a mode parameter that can be set to either protection or normal operation, the system can adjust its behavior to match the current usage context, thereby improving both security when needed and usability when protection is not required.
2Reliability
If dummy write operation is frequently requested to user to maintain data protection, then security against information leakage is improved, but operation complexity increases
Solution Approach 1:
The memory card automatically manages its own protection state through the timer mechanism. When in data protection mode, the card autonomously prohibits read access after the elapsed time exceeds the predetermined period without requiring user intervention. The dummy write operation is automatically performed by the card itself to reset the timer, eliminating the need for user awareness or action.
3Reliability
If user must always prepare both protected and general memory cards, then data security for important information is improved, but convenience of carrying and usage is significantly reduced
Solution Approach 1:
The memory card achieves multi-functionality by integrating both data protection mode and normal mode into a single device. The mode setting section allows the card to function as either a secure storage device or a general-purpose storage device depending on the stored content and current mode setting. This eliminates the need for users to maintain separate protected and unprotected cards, providing universal functionality in one device.
Data Source
AI summary
Versatility of a memory card is improved by providing a memory card where data protection mode and normal mode can be selected at discretion. A portable auxiliary storage device includes a mode setting section, a mode detecting section and a memory access control section. The mode setting section allows a user to set a normal mode permitting reading data stored in a memory section or writing the data to the memory section without restriction and a data protection mode for restricting the reading or writing. The mode detecting section detects a mode set in the mode setting section. The memory access control section controls the read or write according to a state of the mode setting section detected by the mode detecting section.