data integrity protection method, communication device, terminal device, access network device, main network device, computer-readable media, and communication system

摘要

this application provides a method of protecting device and data integrity. a terminal device obtains an integrity protection algorithm and a key corresponding to a session, and a drb corresponding to the session, and performs, using the integrity protection algorithm and the key corresponding to the session, integrity protection on data from the corresponding drb the session; or a terminal device obtains an integrity protection algorithm and a key corresponding to a flow, and a drb corresponding to the flow, and performs, using the integrity protection algorithm and the key corresponding to the flow, integrity protection on drb data corresponding to the flow, where a session includes a plurality of flows, different integrity protection algorithms and keys can be used for different sessions, and different integrity protection algorithms and keys can also be used for different flows. in this way, integrity protection is more flexible and meets the security requirements of the same user for different services.