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

Active Publication Date: 2019-02-01
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing decryption methods for LTE signaling monitoring devices all obtain the original parameters of the derivation key from the S6a / S10 interface on the core network side, and all need to directly or indirectly access the S6a / S10 interface on the core network side. This approach does not work with LTE-Advanced air interface monitors for wireless testing

Method used

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  • A decryption device and method for an LTE-advanced air interface monitor
  • A decryption device and method for an LTE-advanced air interface monitor
  • A decryption device and method for an LTE-advanced air interface monitor

Examples

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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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Abstract

The invention discloses a decryption device and method of an LTE-Advanced air interface monitor, which belongs to the field of signaling monitoring of mobile communication systems. Through a protocol analysis module, a key derivation module, a decryption algorithm module and a decryption parameter maintenance module, the decryption method can be used without connecting In the case of the S6a / S10 interface on the core network side, the PDCP PDU, RRC PDU, and NAS PDU are parsed out, the security-related parameters of LTE-Advanced are obtained, and all parameters of the AS / NAS decryption process are deduced. / NAS data is decrypted to enable real-time wireless monitoring of the LTE‑Advanced air interface.

Description

technical field [0001] The invention belongs to the field of signaling monitoring of mobile communication systems, and in particular relates to a decryption device and method for an LTE-Advanced air interface monitor. Background technique [0002] LTE-Advanced is a standard launched by 3GPP to meet the requirements of ITU IMT-Advanced (4G). The LTE-A downlink peak rate reaches 1Gbps, the uplink peak rate reaches 500Mbps, and the uplink and downlink peak spectrum utilization reaches 15bps / Hz and 30bps / Hz respectively. LTE-A is a smooth evolution of LTE and is backward compatible with LTE R8 / R9. The LTE system architecture includes a terminal (UE), an evolved access network (E-UTRAN) and an evolved core network (EPC). Among them, E-UTRAN is composed of multiple base stations (eNodeB). The UE is connected to the eNodeB through the air (Uu) interface, the eNodeB is connected to the EPC through the S1 interface, and the base stations are connected through the X2 interface. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W12/02H04W12/04H04W92/10H04W12/03H04W12/033H04W12/041
CPCH04W12/02H04W12/04H04W92/10H04W24/00
Inventor 王嘉嘉杨传伟凌云志黄武徐波
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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