A kind of off-line pos machine transaction method and system

Abstract

The invention provides an offline POS machine transaction method. In the initialization process, key information, transaction data and user information are generated at each end and communicate with each other, and the mobile terminal calculates and generates the real private key du according to the private key factor r and the temporary private key k. =r+k; transaction process: the mobile terminal uses the real private key du to sign the transaction data T to generate the signature value S, and then generates the transaction two-dimensional code; the POS machine obtains information after scanning the transaction two-dimensional code, and according to the user information U, the public key Pca and the public key factor Pu generate the digest value e", and calculate and generate the real public key Qu=Pu+[e"]Pca; the POS machine uses the real public key Qu to verify the signature value S and process the transaction data T . The method reduces the amount of information in the transaction process, and at the same time can ensure the security of the transaction.

Description

technical field [0001] The invention relates to the technical field of two-dimensional code transaction, in particular to an off-line POS machine transaction method and an off-line POS machine transaction system based on two-dimensional code. Background technique [0002] Existing mobile payment methods mainly include two methods; online two-dimensional code consumption transaction and offline two-dimensional code consumption transaction. [0003] At present, most QR code consumption transactions adopt online transactions, that is, both user terminals and POS machines need to be connected to the management platform during the transaction process, and the transaction needs to be deducted before the transaction is completed. The transaction process is relatively long, and it is not suitable for fast consumption scenarios such as buses and subways. . [0004] Offline QR code consumption transaction refers to the process of swiping the QR code after the user terminal generates ...

AI Technical Summary

Problems solved by technology

[0005] However, in the offline state, when the user terminal and the offline POS machine conduct a two-dimensional code transaction, the two-dimensional code information usually needs to include four parts of information: the user's public key, identity information, management platform signature, and the user's signature on the transaction data. The total data length of the two-dimensional code will be longer. For the POS machine with limited scanning information, due to its limited scanning ability and computing power, it does not support scanning and calculation of the two-dimensional code with a large amount of information, resulting in offline transactions. Obstacles; in addition, there are certain security risks in the offline transaction of the QR code, which may easily lead to the theft and tampering of user information and transaction data, etc., and the problem of unverification

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