RFID Secure Entry System Using Dynamic Frequency Selection
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Solution Overview
Problem
RFID systems are vulnerable to security issues like wiretapping, forgery, and denial of service due to inadequate encryption methods, and frequency jamming occurs in environments with multiple readers and tags, especially in narrow spaces.
Innovation Solution
A secure entry method that transmits and receives double-encrypted data on randomly selected frequencies using a master key and temporary key, ensuring only registered readers and tags can communicate effectively, preventing reverse detection and frequency jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RFID systems use conventional encryption methods and fixed frequencies, then device complexity is reduced, but security is compromised due to wiretapping, forgery, and reverse detection vulnerabilities
Solution Approach 1:
The patent implements dynamic frequency selection where the communication frequency changes randomly between transmission and reception operations. The reader and tag dynamically negotiate and switch frequencies based on pre-shared frequency lists, preventing fixed-frequency wiretapping and reverse detection while maintaining manageable system complexity through algorithmic randomness rather than complex cryptographic key management.
Solution Approach 2:
The patent segments the frequency spectrum into multiple channels that are pre-shared between legitimate reader and tag. By dividing communication across multiple frequencies and selecting different frequencies for different operations (transmission vs. reception), the system creates security through frequency diversity without requiring complex encryption algorithms, thus improving security while controlling device complexity.
2Productivity
If multiple readers and tags operate simultaneously in narrow spaces, then system capacity increases, but frequency jamming occurs due to inappropriate frequency distribution
Solution Approach 1:
The patent applies dynamic frequency allocation where each reader-tag pair independently selects frequencies from their pre-shared lists during communication. This dynamic selection adapts to the operational context and allows multiple pairs to coexist in narrow spaces by naturally avoiding frequency conflicts, thereby increasing system capacity while preventing frequency jamming without requiring centralized frequency management.
Solution Approach 2:
The patent changes the frequency parameter dynamically during operation based on pre-shared frequency lists. By varying the operating frequency between transmission and reception phases and allowing different reader-tag pairs to use different frequencies from their respective lists, the system accommodates multiple simultaneous operations in narrow spaces while avoiding frequency jamming through parameter diversity rather than complex coordination protocols.
3Reliability
If symmetric cryptosystems and hash functions are used for encryption, then data security is improved, but processing speed decreases and memory requirements increase
Solution Approach 1:
The patent replaces the mechanical/computational system of symmetric encryption and hash functions with a radio-frequency-based security mechanism. Instead of encrypting data bits through complex mathematical operations, the system embeds security in the physical layer by using pre-shared frequency lists and dynamic frequency selection. This substitution achieves data security through frequency-domain separation rather than bit-level encryption, dramatically improving processing speed while maintaining security, especially for low-power RFID systems.
Data Source
AI summary
The present invention relates to a secure entry method of a radio-frequency identification (RFID) secure entry system including a tag, a reader, a detector, a remote controller, and a locker. According to the present invention, since different data is exchanged all the time using a pre-shared encryption/decryption algorithm to transmit/receive the same data, even when reverse detection occurs from outside, accurate detection may not be easy. Furthermore, since a frequency for data transmission is randomly allocated within a pre-defined frequency list, reverse detection and jamming during communication may be prevented.