Patent ID: 9729523
Date: 2017-08-08
CPC Classifications: G06F,H04L,H04W

Claim:
1. A method for negotiating encryption algorithms in a communication system, wherein the communication system comprises a core network element, an access network element and a mobile station (MS), and wherein an A5/4 encryption algorithm is supported by the MS, and is not supported by a plug-in card of the MS, the method comprising: obtaining, by the core network element, information that the plug-in card of the MS does not support the A5/4 encryption algorithm according to an authentication vector of the MS; determining, by the core network element, an encryption algorithm list excluding the A5/4 encryption algorithm according to the information that the plug-in card of the MS does not support the A5/4 encryption algorithm; and sending, by the core network element, the encryption algorithm list to the access network element to ensure that an encryption algorithm excluding the A5/4 encryption algorithm is selected by the access network element for data encryption, even if an encryption algorithm list including the A5/4 encryption algorithm is sent by the MS to the access network element.