DATA TRANSMISSION METHOD, APPARATUS AND SYSTEM

Embodiments of the present invention relate to the field of Internet technologies, and disclose a data transmission method, apparatus, and system. The method includes: receiving, by an intermediate device, a first data transmission message sent by a first device and carrying first data, where the first data is target data encrypted by using a first encryption key; performing, by the intermediate device based on a first decryption key agreed upon between the intermediate device and the first device, decryption processing on the first data to obtain the target data, and performing preset data processing on the target data; performing, by the intermediate device based on a second encryption key agreed upon between the intermediate device and a second device, encryption processing on the target data that undergoes data processing, to obtain second data; and sending, by the intermediate device, a second data transmission message carrying the second data to the second device. The present invention may enable the intermediate device to work normally.