Decryption device and method for radio resource control (RRC) signaling

Abstract

The invention discloses a decryption method and a decryption device for radio resource control (RRC) signaling. The method comprises the following steps of: extracting an RRC decryption parameter and user equipment (UE) identification information from a message related to the security of a US access layer; establishing an RRC message decryption parameter data structure by utilizing the UE identification information; assigning members of the RRC message decryption parameter data structure, and deducing key information required by RRC decryption; and finding the RRC message decryption parameter data structure by utilizing the UE identification information, and decrypting an encrypted RRC message by utilizing the key information in the data structure, serial number (SN) information in a packet data convergence protocol (PDCP) protocol data unit (PDU) bearing the RRC message, the bearer information of the RRC message and the transmission direction information of the RRC message. According to the method and the device, the captured encrypted RRC message can be decrypted by a protocol monitoring analysis system without the related configuration of a long term evolution (LTE) network and the pre-configuration of the protocol monitoring analysis system for the LTE network for UE decryption related data.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to the application field of communication network protocol monitoring and analysis technology. Background technique [0002] As an evolution technology of 3G (Third Generation), LTE can not only provide higher data rate and capacity, larger coverage, but also reduce service delay and system operating cost, which is beneficial for operators to launch more real-time, High-speed services, thereby attracting more high-end users. Compared with the UMTS system, the network structure and protocol of the LTE system have also undergone great changes. The schematic diagram of the LTE network structure is as follows. [0003] Such as figure 1 As shown, the wireless access part of the LTE system is composed of a node such as eNodeB, the core network part is mainly composed of MME entity, S-GW (ServingGateway) entity, PDNGateway entity and PCRF entity, etc., and HSS is a shared entity of al...

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Problems solved by technology

[0008] The disadvantage of such a technical solution applied to the monitoring and analysis of the LTE network protocol is that the network structure, interface, and protocol of the LTE network system have undergone great changes compared with the UMTS network system, and it is not possible to simply extract information from an interface. It can realize the decryption of messages, which is mainly reflected in the LTE network. The RNC entity is cancelled. Its functions are realized by eNodeB and MME, and RRC messages are only transmitted on the air interface; and the LTE network system is more secure than the UMTS network system in terms of security mechanism. Perfect, so the existing approximation scheme is unable to decrypt encrypted RRC messages during LTE network protocol monitoring and analysis

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