Fingerprint lock and work method thereof

Abstract

The invention discloses a fingerprint lock and a work method thereof. The work method comprises the following steps that a master control MCU generates an updated secret key through a preset mode, encrypts operation command to be sent and the updated secret key by using a newly-stored secret key, then joins in a first communication message, sends to a fingerprint module and stores the updated secret key; the fingerprint module receives the first communication message, then uses the newly-stored secret key to decrypt the first communication message, and verifies a decrypted communication content; the fingerprint module successfully verifies the communication content, then stores the updated secret key, and executes an operation instruction in the communication content; the fingerprint module encrypts an operation result executing the operation instruction by using the newly-stored updated secret key, joins in a second communication message, and feeds back the second communication message to the master control MCU; and the master control MCU verifies the second communication message and carries out corresponding processing. In the scheme, the safety of the fingerprint lock is effectively increased through a low cost mode.

Description

technical field [0001] The invention relates to the field of intelligent locks, in particular to a fingerprint lock and a working method thereof. Background technique [0002] As the fingerprint lock market is booming, various cracking methods and videos are gradually exposed to the public's view, and the security of fingerprint locks is becoming more and more concerned by consumers. The current fingerprint lock, the fingerprint module and the main control MCU usually use UART or SPI interface for communication. The communication content is plain text or simple encryption, which is easy to be cracked by replay attack. If the hardware encryption scheme is used, it needs An additional encryption chip is added, which increases the size and cost. Contents of the invention [0003] The main purpose of the present invention is to provide a fingerprint lock and its working method, aiming at improving the security of the fingerprint lock at low cost. [0004] In order to achieve...

AI Technical Summary

Problems solved by technology

The current fingerprint lock, the fingerprint module and the main control MCU usually use UART or SPI interface for communication. The communication content is plain text or simple encryption, which is easy to be cracked by replay attack. If the hardware encryption scheme is used, it needs An additional encryption chip is added, which increases the size and cost

Images