Identity authentication method, device, and system

A non-transitory, computer-readable medium storing one or more instructions executable by a computer system to perform operations comprising:

• recording, in a database at a server device, association information received from a plurality of mobile devices, wherein each mobile device is associated with a user that is pre-registered with the server device and the association information received from each of the plurality of mobile devices includes identification information associated with a cashier device, user identity information associated with a corresponding pre-registered user, and a signal strength information indicative of a distance between the respective mobile device and the cashier device;
• recording, by the server device in the database, a timestamp for each association information received from the plurality of mobile devices, each timestamp corresponding to the time at which the respective association information was recorded at the server device, wherein association information whose storage duration exceeds a predetermined duration is removed from the database;
• marking, by the server device in the database, multiple users as payment candidates, the users associated with mobile devices corresponding to association information recorded by the server device, the association information comprising a signal strength that exceeds a threshold;
• receiving, at the server device, an identification request from the cashier device, wherein the identification request includes identity information associated with a particular user, the identity information including face image information;
• in response to receiving the identification request:
• determining, by the server device, multiple mobile devices of the plurality of mobile devices corresponding to the users marked as payment candidates in the database;
• responsive to determining the multiple mobile devices of the plurality of mobile devices corresponding to the users marked as payment candidates in the database, identifying pre-registered users associated with the multiple mobile devices of the plurality of mobile devices as payment candidates corresponding to the cashier device;
• in response to identifying the payment candidates corresponding to the cashier device:
• calculating, by the server device for each payment candidate corresponding to the cashier device, a similarity metric by comparing the face image information associated with the particular user with a standard face image information associated with that payment candidate;
• determining, by the server device, that the largest similarity metric of the calculated similarity metrics is more than a predetermined similarity threshold;
• in response to determining that the largest similarity metric is more than the predetermined similarity threshold, determining, by the server device, that a difference between the largest similarity metric and the next largest similarity metric is more than a predetermined confounding difference value;
• and
• in response to determining that the difference between the largest similarity metric and the next largest similarity metric is more than the predetermined confounding difference value, determining, as a user account corresponding to the particular user, a payment candidate user account associated with a payment candidate corresponding to the largest similarity metric;
• and
• in response to determining the payment candidate user account, transmitting, by the server device to the cashier device, information indicative of the payment candidate user account to the cashier device for making a payment.

A computer-implemented system, comprising:

• one or more computers;
• and
• one or more computer memory devices interoperably coupled with the one or more computers and having tangible, non-transitory, machine-readable media storing one or more instructions that, when executed by the one or more computers, perform one or more operations comprising:
• recording, in a database at a server device, association information received from a plurality of mobile devices, wherein each mobile device is associated with a user that is pre-registered with the server device and the association information received from each of the plurality of mobile devices includes identification information associated with a cashier device, user identity information associated with a corresponding pre-registered user, and a signal strength information indicative of a distance between the respective mobile device and the cashier device;
• recording, by the server device in the database, a timestamp for each association information received from the plurality of mobile devices, each timestamp corresponding to the time at which the respective association information was recorded at the server device, wherein association information whose storage duration exceeds a predetermined duration is removed from the database;
• marking, by the server device in the database, multiple users as payment candidates, the users associated with mobile devices corresponding to association information recorded by the server device, the association information comprising a signal strength that exceeds a threshold;
• receiving, at the server device, an identification request from the cashier device, wherein the identification request includes identity information associated with a particular user, the identity information including face image information;
• in response to receiving the identification request:
• determining, by the server device, multiple mobile devices of the plurality of mobile devices corresponding to the users marked as payment candidates in the database;
• responsive to determining the multiple mobile devices of the plurality of mobile devices corresponding to the users marked as payment candidates in the database, identifying pre-registered users associated with the multiple mobile devices of the plurality of mobile devices as payment candidates corresponding to the cashier device;
• in response to identifying the payment candidates corresponding to the cashier device:
• calculating, by the server device for each payment candidate corresponding to the cashier device, a similarity metric by comparing the face image information associated with the particular user with a standard face image information associated with that payment candidate;
• determining, by the server device, that the largest similarity metric of the calculated similarity metrics is more than a predetermined similarity threshold;
• in response to determining that the largest similarity metric is more than the predetermined similarity threshold, determining, by the server device, that a difference between the largest similarity metric and the next largest similarity metric is more than a predetermined confounding difference value;
• and
• in response to determining that the difference between the largest similarity metric and the next largest similarity metric is more than the predetermined confounding difference value, determining, as a user account corresponding to the particular user, a payment candidate user account associated with a payment candidate corresponding to the largest similarity metric;
• and
• in response to determining the payment candidate user account, transmitting, by the server device to the cashier device, information indicative of the particular payment candidate user account to the cashier device for making a payment.