A decryption device and method for an LTE-advanced air interface monitor
A technology of air interface and monitoring instrument, which is applied in the direction of safety devices, wireless communication, electrical components, etc., and can solve problems such as inapplicability
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Embodiment 1
[0047] like figure 1 As shown, the LTE system is composed of UE, E-UTRAN, and EPC. Among them, E-UTRAN is composed of multiple eNodeBs, EPC is composed of multiple MME / S-GWs, UE and eNodeB are connected through the Uu interface, and eNodeBs are connected through X2 Interface connection, the eNodeB and MME / S-GW are connected through the S1 interface.
[0048] like figure 2 As shown, the input parameters include the decryption key KEY, the counter value COUNT, the bearer ID BEARER ID, the uplink and downlink direction indication DIRECTION, and the length of the key stream LENGTH. Or post generate plaintext.
[0049] like image 3 As shown, the decryption device of the LTE-Advanced air interface monitor includes a protocol analysis module 1, a key derivation module 2, a decryption algorithm module 3 and a decryption parameter maintenance module 4, and the output terminals of the protocol analysis module 1 are respectively connected to the key The deduction module 2, the decr...
Embodiment 2
[0063] On the basis of the foregoing embodiments, the present invention also mentions a decryption method of an LTE-Advanced air interface monitor (such as Figure 4 Shown), the signaling on the air interface is decrypted, wherein, proceed as follows:
[0064] Step 1: Analyze the RRC connection establishment message through the protocol analysis module, extract the parameter rb-Identity carried therein, parameter AS BEARER ID=rb-Identity-1;
[0065] Step 2: Analyze the authentication request message through the protocol analysis module, and extract the parameter RAND carried in it;
[0066] Step 3: Through the key derivation module and using the known root key K and RAND, calculate CK and IK; use CK and IK to calculate KASME; use KASME to calculate KNASenc and KeNB; use KeNB to calculate KUPenc and KRRCenc; when decrypting NAS messages, parameter NAS KEY=KNASenc; when decrypting AS RRC messages, parameter AS KEY=KRRCenc; when decrypting AS user data, parameter AS KEY=KUPenc; ...
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