Fingerprint Sensing IC with Integrated Encryption and Multiplexer
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Solution Overview
Problem
Fingerprint data is vulnerable to theft during transmission between fingerprint sensing devices and microcontrollers in conventional electronic systems due to their separate semiconductor manufacturing processes and packaging, allowing external hackers to access the signal connection channel.
Innovation Solution
A fingerprint sensing integrated circuit device is designed with a fingerprint sensing device and an encryption unit integrated into a single chip package, utilizing a multiplexer to selectively output either raw fingerprint data or encrypted data to a transmission interface, preventing unauthorized access by ensuring all components are within the same package and securely encrypted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fingerprint sensing device and microcontroller are produced with different semiconductor manufacturing processes and disposed in different packages, then each component can be optimized independently for its specific function, but the signal transmission path between them becomes vulnerable to external hacking and data theft
Solution Approach 1:
The patent merges the fingerprint sensing device and microcontroller into a single integrated circuit device, eliminating the external signal transmission path between them. The fingerprint sensing unit, encryption unit, and microcontroller are all disposed within the same package, making data theft through external interception impossible while maintaining independent functional optimization through modular internal design
2Adaptability or versatility
If fingerprint data is transmitted from fingerprint sensing device to microcontroller through external connection, then the system architecture allows flexible component selection and replacement, but the transmitted data can be stolen by external hackers
Solution Approach 1:
The patent combines the fingerprint sensing device and microcontroller into one integrated package, eliminating external data transmission paths and ensuring security. Component flexibility is maintained through modular internal architecture where different fingerprint sensing units can be integrated with the same microcontroller platform
Solution Approach 2:
The patent implements encryption before data leaves the integrated circuit device. The encryption unit encrypts fingerprint data within the secure package before any external transmission occurs, so even if data is transmitted externally, it remains protected from theft
3Reliability
If encryption unit is added to encrypt fingerprint data, then data security is improved, but the device complexity and manufacturing process become more complicated
Solution Approach 1:
The encryption unit is integrated within the same package as the fingerprint sensing device and microcontroller, forming a unified secure system. This merging reduces overall system complexity compared to having separate encrypted communication modules, while providing comprehensive security for all data paths
Data Source
AI summary
A fingerprint sensing integrated circuit device includes a fingerprint sensing device, an encryption unit, a multiplexer and a transmission interface. The encryption unit is connected to the fingerprint sensing device. The multiplexer has an output end, a first input end and a second input end. The first input end of the multiplexer is connected to the fingerprint sensing device. The second input end of the multiplexer is connected to the encryption unit. The multiplexer connects the output end to the second end according to a selection signal. The transmission interface is connected to the output end of the multiplexer.