Secure Financial Transaction System Using NFC Key Exchange
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Solution Overview
Problem
Existing communication techniques for financial transactions lack robust security, particularly in wireless networks, where data can be intercepted by third parties, and tokens used for authorization are often compromised due to predictability.
Innovation Solution
A system utilizing near field communication for exchanging encryption keys over a short distance and a second wireless communication technique, such as Bluetooth or cellular communication, for transmitting documents and encrypted information associated with financial transactions, ensuring secure authorization and approval through public-key/private-key cryptography.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If encryption keys are transmitted through wireless networks using conventional techniques, then communication range is extended, but security is compromised due to potential interception by third parties
Solution Approach 1:
The patent segments the communication process into two distinct phases: (1) NFC-based key exchange for secure authentication, and (2) WiFi-based data transmission for extended range. This segmentation allows each communication mode to be optimized for its specific function, maintaining security while extending range.
Solution Approach 2:
The patent introduces an intermediary authentication mechanism where encryption keys are exchanged through NFC before the actual data transmission occurs over WiFi. This intermediary step ensures that both parties are verified and authenticated before sensitive financial information is transmitted, preventing unauthorized access even when communication range is extended.
2Ease of operation
If tokens such as pin codes or passwords are used to authorize financial transactions, then authorization capability is provided, but security is compromised because human memory limitations result in predictable tokens
Solution Approach 1:
The patent replaces the mechanical system of human memory-based tokens (PIN codes, passwords) with an electronic authentication system using NFC technology. The authentication keys are stored in secure elements of mobile devices and automatically exchanged through NFC communication, eliminating the need for users to remember complex tokens while maintaining strong security through cryptographic key exchange.
3Ease of operation
If data packets containing financial information are transmitted over wireless networks, then communication convenience is improved, but security is worsened because it is difficult to ensure packets are received only by intended receivers
Solution Approach 1:
The patent performs preliminary authentication through NFC key exchange before the actual financial transaction data is transmitted over WiFi. The encryption keys are established in advance during the NFC pairing phase, ensuring that subsequent WiFi communications are securely encrypted and can be reliably delivered only to the intended recipient, maintaining both convenience and security.
Data Source
AI summary
A system that communicates information is described. During operation, this system receives an encryption key through a first wireless communication technique, wherein the first wireless communication technique includes near field communication. Then, the system communicates a document through a second wireless communication technique, where the document is associated with a financial transaction being conducted with a commercial establishment. Next, the system receives encrypted information through the second wireless communication technique, where the encrypted information is, at least in part, encrypted using the encryption key, and where the second wireless communication technique includes a technique other than near field communication.