Quantum-Resistant CBDC System for Privacy and Security
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Solution Overview
Problem
Central bank digital currencies (CBDCs) face challenges in preventing unauthorized aggregation and counterfeiting, especially with the threat of quantum computing, and existing systems lack robust mechanisms for user privacy and key management.
Innovation Solution
A software-based CBDC system that utilizes RSA cryptosystems, blind signatures, and mix networks to ensure user privacy and security, with a protocol that allows users to securely manage their keys and trace transactions, while preventing unauthorized access and counterfeiting, even in the presence of quantum computing threats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional eCash technology with blind signatures is used, then user privacy is protected, but the system becomes vulnerable to quantum computing attacks and counterfeiting
Solution Approach 1:
The patent changes the cryptographic parameters from classical RSA to quantum-resistant algorithms such as lattice-based cryptography, hash-based signatures, or code-based cryptography. This parameter change maintains security against quantum computing attacks while preserving the overall system architecture and user privacy features of eCash
Solution Approach 2:
The patent substitutes the mechanical cryptographic system (classical RSA blind signatures) with a quantum-resistant cryptographic system. This substitution replaces the underlying mathematical assumptions from factoring-based security to post-quantum secure assumptions, thereby eliminating vulnerability to quantum computing attacks
2Reliability
If commercial banks control all customer interactions and KYC checks, then anti-money laundering compliance is improved, but user anonymity and privacy are reduced
Solution Approach 1:
The patent segments the system into two distinct layers: a public layer where anonymous transactions occur using quantum-resistant cryptography, and a regulatory layer where banks perform KYC/AML checks on suspected suspicious activities. This segmentation allows compliance without compromising everyday user privacy
Solution Approach 2:
The patent introduces quantum-resistant cryptographic protocols as an intermediary mechanism that enables banks to verify transaction legitimacy and perform AML/CFT checks without being able to trace or identify individual users in normal transactions. The cryptography acts as a mediator that preserves anonymity while allowing regulatory oversight
3Ease of manufacture
If software-only architecture is used, then system cost is reduced, but security against key compromise becomes more challenging
Solution Approach 1:
The patent substitutes physical hardware security modules with software-based quantum-resistant cryptographic implementations. The enhanced cryptographic algorithms provide mathematical security that does not rely on physical hardware, thereby reducing costs while maintaining or improving security against key compromise through quantum-resistant properties
4Reliability
If quantum-resistant cryptography is implemented, then security against counterfeiting is improved, but computational overhead and processing time increase
Solution Approach 1:
The patent selects quantum-resistant cryptographic algorithms with optimized parameters that balance security strength and computational efficiency. By carefully choosing algorithm parameters and implementation details, the system achieves counterfeiting prevention while minimizing impact on transaction processing speed
Data Source
AI summary
The Central Bank Digital Currency (CBDC) introduced here is software only and anonymous—yet aggregation of amounts larger than those issued each user is thwarted. Each user has the ability to undo the anonymity of any value they should obtain, and this ability is in effect irrevocable even if the user wishes to give it up, which makes value obtained from multiple users risky to hold or spend. If the value issued a user has already been spent by someone other than the user, for instance, the user can at least reveal where it was spent; but if the value is not already spent, the user can spend it first thereby preventing anyone from spending it later.