Digital Signature Terminal Module Switching for Secure Mobile Key Storage
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Solution Overview
Problem
Computer terminals lack a secure environment for calculating digital signatures due to software and hardware deficiencies, leading to security risks such as private key leakage, especially in mobile devices without USB interfaces.
Innovation Solution
A digital signature terminal comprising a first module with a communication component and a second module for generating digital signatures, where the first module can connect or disconnect from the second module based on user instructions, ensuring secure storage and transmission of digital signatures through a memory and communication components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If USB keys and smart cards are used for digital signature operations, then security of key storage and data operations is improved, but device complexity increases and usability is limited to devices with USB interfaces
Solution Approach 1:
The patent introduces a portable digital signature terminal as an intermediary device between the mobile device and the digital signature operation. This terminal includes a processor, memory, and communication interface that can interface with mobile devices without requiring USB interfaces. The terminal performs secure signature operations externally, eliminating the need for USB keys or smart cards while maintaining security and expanding compatibility to all mobile devices.
2Ease of operation
If computer terminals are used for digital signature calculations, then ease of operation is improved, but security deteriorates due to software and hardware deficiencies
Solution Approach 1:
The patent segments the digital signature operation into two separate components: a user interface portion that remains on the mobile device for ease of operation, and a secure calculation portion that is performed on the portable digital signature terminal. This segmentation allows the mobile device to maintain its user-friendly interface while the security-critical signature calculation is performed in a dedicated, secure environment on the terminal, thereby resolving the contradiction between ease of operation and security.
3Adaptability or versatility
If mobile devices without USB interfaces are used, then adaptability is improved, but ease of operation with digital signature devices deteriorates
Solution Approach 1:
The portable digital signature terminal serves as an intermediary that bridges mobile devices without USB interfaces and the digital signature operation. It includes a communication interface that can connect to various mobile devices through different protocols (such as NFC, Bluetooth, or other wireless interfaces), enabling these devices to perform secure signature operations without requiring USB connectivity, thus maintaining both adaptability and ease of operation.
Data Source
AI summary
A digital signature terminal device and a secure communication method are provided. The digital signature terminal includes a first module and a second module. The first module includes a communication component configured to communicate with outside and includes a central unit. The central unit includes a memory configured to store data received by the communication component. The central unit is configured to receive an operation from a user, and is controlled, in response to the operation from the user, to be simultaneously connected to the second module and disconnected from the communication component or to be simultaneously disconnected from the second module and connected to the communication component. The second module includes a signature component configured to generate a digital signature for the data, and the second module is configured to send the digital signature to the memory.