Method and device for obtaining public key
A technology of public key and public alarm system, applied in the field of communication, which can solve the problems of absence of CAx, no deployment of globalized CA, inability to verify PWS messages, etc.
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Embodiment 1
[0131] refer to figure 1 , figure 1 It is a flowchart of a method for obtaining a public key provided by Embodiment 1 of the present invention. Such as figure 1 Shown:
[0132] Step 101, the network element receives the CA list of the global certification authority center reported by the user or the determined CA information;
[0133] In this step, the network elements include:
[0134] Core network nodes, CBE, CA;
[0135] Wherein, the network element entity of the core network node is MME in the LTE network, the network element entity in the UMTS network is SGSN, and the network element entity in the GSM or GPRS network is MSC or SGSN, or a CBC node.
[0136] When the user is attached to the roaming network, and optionally the user does not pre-store the public key of the local CA or the local CBE of the roaming network, the PWS message or other messages issued by the local CBE cannot be verified. If a mutual trust relationship is established between global CAs, it mea...
Embodiment 2
[0151] refer to figure 2 , figure 2 It is a flowchart of a method for obtaining a public key provided by Embodiment 2 of the present invention.
[0152] Step 201, the local core network entity receives the global authentication authority center CA list reported by the user or the determined CA information;
[0153] Preferably, the local core network entity receives the global CA list reported by the user, refer to image 3 Step 301 of and Figure 4 Step 401.
[0154] Preferably, the local core network entity receives the determined CA information reported by the user, refer to Figure 5 Step 501 of and Image 6 Step 601.
[0155] Step 202, when the local CA is not in the global CA list or is not a determined CA, the local core network entity obtains the cross-certificate of any CA in the global CA list or the cross-certificate of a determined CA;
[0156] Preferably, the local core network entity receives the global CA list reported by the user, when the local CA is n...
Embodiment 3
[0195] refer to Figure 7 , Figure 7 It is a flowchart of a method for obtaining a public key provided by Embodiment 3 of the present invention. Such as Figure 7 Shown:
[0196] Step 701 , the local CBE receives the global CA list or the determined CA information issued by the local core network entity.
[0197] Preferably, the local CBE receives the global CA list forwarded by the local core network entity, and the core network entity directly forwards the global CA list to the local CBE. specific reference Figure 8 Step 801 and Step 802 of and Figure 9 Step 901 and Step 902 of .
[0198] In this specification, the core network entities are described by taking the MME in the LTE network as an example.
[0199] Preferably, the MME selects any CA from the global CA list, and delivers the selected CA to the local CBE. specific reference Figure 10 Step 1001 and Step 1002 of and Figure 11 Step 1101 and Step 1102 of .
[0200] Preferably, the local CBE receives the...
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