The invention provides a method,
system and device for data
encryption transmission between isolation networks based on a two-dimensional code and a medium, and belongs to the technical field of
data transmission. The method comprises the steps that a form needing to be transmitted is acquired from an
intranet, and key fields are extracted; converting the
primary key field into a
short code by using a mapping table, splicing the
short code with the basic field and the service field, and adding a check code to obtain
source data; after encrypting and encoding the
source data, converting the
source data into a two-dimensional code, and transmitting the two-dimensional code to an external network
system through a physical medium; scanning the two-dimensional code by using a terminal device in an
extranet, decoding and decrypting the two-dimensional code, and then splitting the two-dimensional code to obtain a
short code, a basic field, a service field and a check code; and performing
data verification by using the
verification code, restoring the short code into the main key field by using the mapping table after the
verification is passed, and restoring the original form according to the main key field, the basic field and the service field. According to the invention, a complete process from internal
network data extraction to external
network data restoration is realized based on the two-dimensional code.