File Transfer Server for Secure Cross-LAN Sharing
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Solution Overview
Problem
Existing file sharing systems across different Local Area Networks (LANs) face security concerns and practical challenges, such as dynamic changes in file availability and poor usability when dealing with multiple folders or files, especially over the Internet.
Innovation Solution
A file transfer server mechanism is implemented, which includes a list preparation section, registration section, and list exchange section, allowing communication between local and external servers to dynamically update and share file lists, ensuring secure and practical access to specific files and folders across LANs via the Internet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If file sharing is implemented across different LANs via the Internet, then file accessibility between networks is improved, but security risks increase
Solution Approach 1:
The patent introduces a file transfer server as an intermediary between communication terminals on different LANs. The server mediates file transfer operations by receiving transfer requests, managing file lists, and coordinating with remote servers, thereby enabling secure file sharing across networks without direct terminal-to-terminal exposure
Solution Approach 2:
The system segments file sharing functionality into distinct components: local file transfer servers, remote file transfer servers, and communication terminals. Each component has specific responsibilities (local server manages local files, remote server provides external access, terminals initiate requests), creating a segmented architecture that enhances security while maintaining accessibility
2Adaptability or versatility
If traditional VPN techniques are used to connect LANs, then network communication is established, but dynamic file sharing capability is lost
Solution Approach 1:
The patent implements dynamic file sharing by enabling communication terminals to request and access file lists from remote servers on-demand. The system dynamically adapts to file availability changes through periodic file list updates and responsive transfer request handling, eliminating the need for fixed pre-configured connections
Solution Approach 2:
The system incorporates feedback mechanisms where file transfer servers periodically update file lists to reflect current file availability, and where transfer requests trigger real-time responses from remote servers. This feedback loop enables the system to adapt dynamically to changes in file sharing requirements without fixed connections
3Quantity of substance
If multiple files and folders are shared in a file sharing system, then file availability increases, but usability deteriorates
Solution Approach 1:
The patent implements preliminary action by having file transfer servers proactively obtain and maintain up-to-date file lists from remote servers. File lists are prepared in advance and stored locally, enabling users to quickly search and access files without waiting for real-time queries to remote servers, thus improving usability despite large numbers of shared files
Data Source
AI summary
A technique allows shared use of a file between different networks via the Internet. File transfer servers on different LANs access file servers on the respective LANs to prepare a list of shared files, respectively. The file transfer servers are registered in a SIP server, and then send a SUBSCRIBE method to each other to issue a request to transfer the file list, respectively. In response to the request, the file lists are exchanged. A communication terminal on each LAN makes a request to acquire a specific file on the basis of information about the shared files stored in the file transfer server. Through a media session, one of the file transfer servers issues a request to acquire the file to the other file transfer server. As a result, the file is transferred to the communication terminal.