Bridging chip, fingerprint encrypting method, fingerprint detecting and encrypting circuit, and method thereof

Abstract

The invention provides a bridging chip, a fingerprint encrypting method, a fingerprint detecting and encrypting circuit, and a method thereof. The fingerprint-encrypting method is used between a fingerprint sensor and a master control end to perform encryption on a fingerprint datum with a universal encryption standard, wherein the bridging chip is applied between the fingerprint sensor and the master control end and comprises an encrypting standard circuit for performing encryption on the first fingerprint data by an encrypting standard for obtaining second fingerprint data. According to themethod, the universal encryption standard is designed to a hardware circuit for arranging in the bridging chip so that the processing speed in an encrypting process accords with fingerprint data transmitting and processing time of the whole system.

Description

Technical field [0001] The invention relates to a fingerprint encryption method, in particular to a circuit and method for fingerprint encryption using an encryption standard. Background technique [0002] Because everyone’s fingerprints are different, fingerprints are often used as the basis for identity authentication. figure 1 Display a known fingerprint recognition system, which includes a fingerprint sensor 10 and a main control terminal 16. The fingerprint sensor 10 includes a sensing unit 12 for detecting the fingerprint of the finger, and the fingerprint sensor 10 will detect the fingerprint The fingerprint data is transmitted to the main control terminal 16 through the transmission interface 14, and the main control terminal 16 compares the received fingerprint data with the fingerprint data of the database to determine whether the user's identity is correct. However, when the transmission interface 14 transmits fingerprint data, the fingerprint data may be stolen. There...

AI Technical Summary

Problems solved by technology

[0003] With the improvement of security requirements, more and more fingerprint encryption systems hope to use general-purpose encryption standards to encrypt fingerprint data, such as using the Advanced Encryption Standard (Advanced Encryption Standard; AES). Encryption using a general-purpose encryption standard on the device 10 requires adding a large number of memory bank circuits and complex encryption operation circuits, which will lead to expansion of the chip area and a significant increase in cost.

Furthermore, due to technological factors, the fingerprint sensor 10 cannot provide a high-frequency clock to handle the encryption process of complex encryption standards. Therefore, even if a circuit implementing a general encryption standard is added to the fingerprint sensor 10, it will still be affected by the encryption process. The processing speed is too slow, resulting in an excessive delay in the transfer of fingerprint data to the main control terminal 16, which cannot meet the time of the entire system for fingerprint data transfer and processing, resulting in errors

Therefore, there is currently no fingerprint sensor 10 or its encryption system that uses a common encryption standard.

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