Message processing method and device

Provided are a message processing method and device, the method comprising: a core network device receiving first information forwarded by an access network device, and decrypting the first information to obtain identification information of a first device and a second parameter, the second parameter being a parameter for coding allocated to the first device by the access network device, the second parameter has randomness, and the second parameter is a parameter of other layers which are lower than the non-access layer; and whether the first information is valid information is determined according to the second parameter obtained from the access network equipment, so that the resource consumption or safety problem caused by the fact that the first information is used for the replay attack can be avoided.