RFID Reader Protocol Bypass Architecture
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Solution Overview
Problem
Existing RFID readers are limited to using only communication protocols and encryption algorithms provided by the secure element manufacturer, restricting their versatility and security capabilities.
Innovation Solution
An RFID reader design featuring a master controller, communication controller, RF frontend, and secure elements that support multiple communication protocols and encryption algorithms, with bypass switches to enable protocol and encryption flexibility, allowing communication via various protocols and algorithms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single secure element is used in the RFID reader, then the device complexity is reduced, but the adaptability to support multiple communication protocols and encryption algorithms is limited
Solution Approach 1:
The patent implements a universal RFID reader architecture where a single reader device can handle multiple communication protocols (ISO14443, ISO15693, etc.) and multiple encryption algorithms by incorporating multiple protocol engines and secure elements. The reader dynamically selects and activates the appropriate protocol engine and secure element based on the detected transponder type, making one device perform the function of multiple specialized devices.
Solution Approach 2:
The reader is segmented into functionally independent modules: multiple protocol engines (first protocol engine, second protocol engine), multiple secure elements (first secure element, second secure element), and a controller that orchestrates their operation. This segmentation allows each module to be optimized for specific protocols while the system as a whole supports multiple protocols through selective activation.
2Device complexity
If multiple secure elements and protocol engines are integrated into a single chip, then the device complexity is reduced, but the security is compromised as users gain access to encryption algorithms
Solution Approach 1:
The patent maintains security by keeping critical encryption algorithms in separate, physically isolated secure elements that are not integrated into the main controller chip. Each secure element operates as an independent security domain with restricted access, preventing users from accessing encryption algorithms even though the overall system is integrated. The controller communicates with secure elements through controlled interfaces that enforce security policies.
3Adaptability or versatility
If separate RF frontends and antennas are provided for each protocol, then the protocol compatibility is improved, but the hardware requirements and costs increase
Solution Approach 1:
The patent implements a universal RF frontend and a single antenna that can operate across multiple frequencies and protocols. The RF frontend is designed with tunable parameters and multiple signal paths that can be dynamically configured to match different protocol requirements. The antenna is designed as a multi-band or wideband antenna that can efficiently transmit and receive signals for various protocols, eliminating the need for separate antenna systems.
Solution Approach 2:
The RF frontend incorporates dynamic switching mechanisms that can reconfigure signal paths, impedance matching networks, and frequency synthesis based on the active protocol. The system dynamically adjusts RF parameters under controller management to optimize performance for the currently active protocol, allowing one hardware platform to adapt to multiple protocols without requiring separate dedicated hardware for each.
Data Source
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Figure 3
AI summary
A RFID reader comprises a master controller connected to a communication controller further controlling a RF frontend for driving an antenna. The master controller and the communication controller each have a protocol engine communicating with a specific secure element. The communication controller further comprises a bypass switch for bypassing the protocol from the master controller protocol engine directly to the RF frontend.