CPK Digital Currency Authentication via Segmented Certification
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Solution Overview
Problem
Existing digital currency systems lack robust security measures to address internal and external threats, particularly in the context of digital banks which require high security standards for online and offline transactions.
Innovation Solution
A CPK-based digital currency system is introduced, featuring a virtual network with identifier-to-identifier authentication, and utilizing digital signatures for authenticity certifications. This system includes account identifier, issuer authenticity, digital currency authenticity, account number authenticity, and amount authenticity certification units, supported by quick response codes for offline verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If digital currency system uses traditional authentication methods, then ease of operation is improved, but security against internal and external threats deteriorates
Solution Approach 1:
The authentication system is segmented into multiple independent certification units (issuer authenticity certification, digital currency authenticity certification, account number authenticity certification, amount authenticity certification). Each unit handles a specific aspect of verification, distributing the security function across multiple components rather than relying on a single authentication mechanism.
Solution Approach 2:
The patent implements nested authentication by placing multiple certification layers within the digital currency structure. The digital currency contains issuer certification, which contains account certification, which contains transaction amount certification. This nested structure allows verification at multiple levels simultaneously, enhancing security while maintaining operational flow.
2Adaptability or versatility
If digital bank operates both online and offline, then adaptability is improved, but security complexity increases
Solution Approach 1:
The digital currency is designed as a universal instrument that functions in both online and offline environments. The same physical or electronic currency unit can be verified through QR codes in offline face-to-face transactions or through digital validation in online group purchase transactions, eliminating the need for separate systems for different operation modes.
Solution Approach 2:
The patent uses QR code copies of the digital currency for offline verification. Instead of requiring complex offline authentication infrastructure, the system creates verifiable copies (QR codes) that contain all necessary certification data, allowing simple scanning and verification on mobile devices without compromising security.
3Ease of operation
If digital currency uses short signature (12 bytes), then ease of operation is improved, but measurement precision of authentication deteriorates
Solution Approach 1:
The patent compensates for the short signature length by adding temporal dimension to authentication. A timestamp is embedded within the digital currency and verified alongside the signature. This adds a time-based verification layer that enhances authentication precision without increasing the signature length, maintaining operational efficiency while improving verification accuracy.
Data Source
AI summary
Disclosed are a CPK-based digital bank, a digital currency and a payment method. The digital currency is a core component of the digital bank. The digital currency is realized by means of a CPK digital signature, and a payer provides an account authenticity certification, an amount authenticity certification and a fund allocation authenticity certification, thereby effectively preventing crimes inside or outside a bank. The digital currency directly takes an account identifier as an account number. The digital currency can be used in on-line operations, as well as off-line operations, thereby satisfying face-to-face trade requirements between a great number of retail accounts. The CPK digital bank is realized by means of a CPK chip without support of other devices, such that everyone can check the authenticity of the digital currency.