Relay Device for Quantum Cryptography Authentication
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Solution Overview
Problem
The high cost and complexity of devices required for quantum cryptography, particularly the single photon detector, hinder the widespread adoption of quantum cryptography technology for general users, and existing solutions are cumbersome for mobile commerce applications.
Innovation Solution
A relay device equipped with an optical receiver unit, optical transmission unit, and processor, including a quantum signal control unit, user authentication unit, and random number generation unit, facilitates quantum cryptography-based user authentication between a mobile device and a server, utilizing polarization or phase time difference properties for secure key generation and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quantum cryptography technology is implemented using traditional single photon detectors, then security is significantly enhanced, but device cost and complexity increase substantially
Solution Approach 1:
The patent uses classical optical signals as copies or representations of quantum states, avoiding the need for actual single photon detectors. The system encodes quantum-like information in classical light fields, allowing quantum cryptography functionality to be achieved through simpler, cheaper classical optical components while maintaining security through quantum-inspired protocols
Solution Approach 2:
The patent replaces the mechanical/physical quantum detection system (single photon detectors) with an optical field-based system. Instead of detecting individual photons with complex quantum hardware, the system uses classical optical detection methods to measure optical field properties that encode quantum cryptographic information, thereby substituting a complex quantum mechanical system with a simpler optical system
2Reliability
If quantum cryptography technology is implemented using traditional single photon detectors, then security is significantly enhanced, but implementation cost increases substantially
Solution Approach 1:
The patent employs inexpensive classical optical components (lasers, modulators, detectors) that can be easily manufactured and replaced, replacing expensive single photon detectors. These classical components are commercially available, well-understood, and significantly cheaper, making quantum cryptography accessible for widespread deployment
Solution Approach 2:
By using classical optical signals to represent quantum states, the system avoids the need for costly quantum detection hardware. The information encoding and decoding processes use standard optical components that are inexpensive and widely available, dramatically reducing implementation costs while preserving cryptographic security
3Reliability
If quantum cryptography technology is implemented with full transmission and reception devices at both ends, then security is maintained, but installation burden and cost increase
Solution Approach 1:
The patent divides the quantum cryptography system into asymmetric components: one end (Alice) generates and transmits quantum-encoded optical signals, while the other end (Bob) performs measurement and key generation. This segmentation allows different functional distributions, enabling scenarios where one party has simpler equipment, thereby reducing overall installation burden while maintaining security through the distributed quantum protocol
Solution Approach 2:
The patent introduces classical communication channels as intermediaries that carry auxiliary information between the quantum communication endpoints. This intermediary classical channel allows for basis comparison, error correction, and key sifting without requiring complex quantum capabilities at both ends, simplifying the overall system deployment and installation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces the cost and complexity of quantum cryptography implementation, enabling secure user authentication and payment services in mobile commerce by distributing the necessary components among the communication device, relay device, and server, thus making high-security quantum cryptography accessible to general users.
Implementation Method 1
utilizing polarization or phase time difference properties for secure key generation and transmission
Data Source
AI summary
Disclosed herein are a quantum cryptography-based cryptographic communication system and an authentication, payment and transaction system via a relay device between a communication device and a server. A relay device for quantum cryptography authentication includes an optical receiver unit, an optical transmission unit, and a processor. The processor includes a quantum signal control unit, a user authentication unit, and a random number generation unit. The optical receiver unit receives a series of second quantum signals generated in such a manner that a series of first quantum signals generated by a first quantum filter and sent from a communication device pass through the second quantum filter of the relay device or a reception side, and the optical transmission unit transfers the series of second quantum signals to a server.