Data transmission method, device, equipment, system, medium and program product

The invention discloses a data transmission method, device, equipment, system, medium and program product, and belongs to the field of data processing. The method comprises the steps that under the condition that a local password function set of second equipment is obtained, a password algorithm identifier and a password application mode identifier are selected from the local password function set, and the local password function set comprises an equipment owner identifier, the password application mode identifier and the password algorithm identifier of the second equipment; according to the selected password application mode, encrypting the to-be-encrypted data by using the selected password algorithm to obtain a data ciphertext; and sending a service message to the second device according to the device owner identifier of the first device, the selected cryptographic algorithm identifier, the cryptographic application mode identifier and the data ciphertext, so that the second device decrypts the data ciphe