Map Output Device Unique Value Binding for Storage Security
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Solution Overview
Problem
Conventional navigation systems cannot prevent a storage medium from being sharedly used among multiple devices, as they lack effective mechanisms to restrict access and usage.
Innovation Solution
A map output device and system that includes a connection unit, an output unit, and a control unit, which writes a unique value to the storage medium when connected or when a predetermined usage amount is exceeded, preventing access from other devices by overwriting initial values with unique values and managing version information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If update authority information is deleted from the storage medium after first use, then map data security is improved, but the storage medium cannot be restricted from shared use among multiple devices
Solution Approach 1:
The patent applies preliminary action by creating a binding relationship between the storage medium and the navigation device before the storage medium is used. The control unit stores medium-identification information from the storage medium together with device-identification information from the navigation device, establishing a unique pairing that prevents the storage medium from being used in other devices. This preliminary binding action occurs during the first connection, ensuring security is established before any map data operations occur.
2Adaptability or versatility
If a unique value file is written to the storage medium when connected or usage amount is exceeded, then storage medium sharing is prevented, but device complexity increases
Solution Approach 1:
The patent applies local quality by implementing different control logic for different situations. When the storage medium is first connected, the control unit stores both medium-identification information and device-identification information together. However, when the storage medium is subsequently connected to a different device or when usage exceeds the predetermined amount, the control unit only stores the device-identification information without the medium-identification information. This localized differentiation in control behavior prevents storage medium sharing while managing device complexity through context-specific logic.
Data Source
AI summary
A map output device is provided for preventing a storage medium from being sharedly used. The map output device comprises a connection unit; an output unit that outputs map data; and a control unit. The control unit is configured, when a storage medium is connected to the connection unit or when a movable body is used beyond a predetermined usage amount, to write a file containing information on a unique value related to the movable body into the storage medium connected to the connection unit, and to output, to the output unit, the map data read from the storage medium.