| 摘要 |
A method for preventing bidding down attacks during motion of a UE is disclosed herein. The method includes: The UE sends a TAU Request message to a new MME; the TAU Request carries UE's stored security capabilities; the UE receives UE's security capabilities sent by the MME; and the UE checks whether the received UE's security capabilities are consistent with the stored UE's security capabilities. A system, an MME, and a UE for preventing bidding down attacks during motion of the UE are disclosed herein. When the UE performs security capability negotiation with the MME, the UE can check whether the received security capabilities are consistent with the stored security capabilities, and determine whether a bidding down attack exists, thus preventing bidding down attacks. |
