NFC Dynamic Token Seed Key Management via Mobile Intermediary
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Solution Overview
Problem
Existing NFC dynamic tokens lack flexibility and security as the seed key, necessary for generating dynamic passwords, cannot be updated by users and requires manual input, which is prone to errors.
Innovation Solution
An NFC dynamic token that uses an NFC channel to write and manage a seed key, allowing it to connect with a mobile device, receive instructions, store the seed key, and generate dynamic passwords, thereby enhancing security and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the seed key is written into the dynamic token by a manufacturer before the token leaves the factory, then the dynamic token can generate dynamic passwords, but the seed key cannot be updated by users which reduces flexibility and security
Solution Approach 1:
The patent introduces a mobile device as an intermediary between the user and the dynamic token. The mobile device communicates with the token via NFC channel, allowing users to update seed keys and receive dynamic passwords without manually inputting them. This intermediary solves the contradiction by enabling flexible user-controlled seed key updates while maintaining simple token hardware design.
2Reliability
If the dynamic password is generated and manually input by the user into a webpage or client side, then identity authentication can be performed, but errors are easy to occur and security is reduced
Solution Approach 1:
The patent replaces the mechanical manual input process with an automated NFC communication process. The dynamic token directly transmits the generated password to the mobile device via NFC channel, eliminating the need for manual typing. This substitution eliminates input errors while maintaining ease of operation through simple NFC tapping.
Data Source
AI summary
A working method of an NFC dynamic token, comprising the following steps: after detecting that a preset press key is triggered, the NFC dynamic token activates NFC communication and builds connection with a mobile device via NFC channel; when the NFC dynamic token receives a second instruction from the mobile device, the NFC dynamic token obtains a seed key from the second instruction, stores the seed key and sends a message that writing is successful to the mobile device; when the NFC dynamic token receives a third instruction from the mobile device, the NFC uses self-stored seed data to generate a dynamic password and sends the dynamic password to the mobile device via the NFC channel. According to the present invention, the seed key is written into the NFC dynamic token via the NFC channel, which improves security and flexibility of the dynamic token.