Two-Dimensional Code Authentication via Self-Verification Blocks
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Solution Overview
Problem
Current technologies lack effective methods to detect falsification of two-dimensional codes, such as QR codes, which are increasingly used in monetary transactions, posing a security risk.
Innovation Solution
A two-dimensional code authenticating device and method that utilizes exclusive OR operations between correction bit strings and encrypted bit strings within the correction area of the code to detect errors and authenticate the code, ensuring its integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional two-dimensional codes are used for monetary transactions, then ease of operation and productivity are improved, but reliability and security deteriorate due to lack of falsification detection
Solution Approach 1:
The correction area of the two-dimensional code is divided into multiple correction blocks, each containing correction bits. This segmentation allows the system to verify integrity by checking relationships between different segments, enabling detection of falsification while maintaining the code's usability in transactions.
Solution Approach 2:
An authentication device acts as an intermediary between the two-dimensional code and the transaction system. This intermediary verifies the authenticity of the code by detecting falsification through error detection mechanisms, thereby enabling secure monetary transactions without complicating the user interface.
2Reliability
If error detection mechanisms are added to two-dimensional codes, then reliability is improved, but device complexity increases
Solution Approach 1:
The two-dimensional code itself contains the means for its own authentication through embedded correction blocks with correction bits. The code structure includes internal verification mechanisms that allow the authenticating device to verify authenticity without requiring external reference data or complex verification protocols, thereby reducing overall system complexity.
3Reliability
If correction area is used for authentication, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The authentication data is pre-encoded into the correction blocks during the code generation process. By embedding the verification mechanism in advance within the standard correction area structure, the system achieves high authentication accuracy without requiring additional manufacturing steps or post-generation modifications, thereby maintaining feasible manufacturing precision requirements.
Data Source
AI summary
A two-dimensional code authenticating device reads a self-authentication two-dimensional code to obtain an RS bit string, and detects a bit string c′ as an error using the RS bit string. Next, an exclusive OR between a bit string l included in the RS bit string and the bit string c′ detected as an error is calculated to obtain a bit string c′, and a bit string md is obtained by decrypting the bit string c′ through a scheme corresponding to the encryption. Subsequently, it is determined whether or not the decrypted bit string md matches the bit string m included in the RS bit string, thereby authenticating the self-authentication two-dimensional code.