Method and device for acquiring temporary mobile subscriber identity codes

Abstract

The invention discloses a method and a device for acquiring temporary mobile subscriber identity codes. The method comprises the following steps: transmitting a network attachment request to a network through a terminal, and determining a physical channel connected with the network so as to establish connection between the terminal and the network; monitoring information issued by the distributed physical channel through the terminal so as to extract all the temporary mobile subscriber identity codes from all the monitored information through indication. According to the method, lots of signaling data at an idle port do not need to be totally analyzed, the processing capacity is reduced, and the cost of acquiring the temporary mobile subscriber identity codes is reduced.

Description

technical field [0001] The embodiment of the present invention relates to information security technology, and in particular to a method and device for obtaining a user temporary identification code. Background technique [0002] International Mobile Subscriber Identification Number (IMSI) is a sign to distinguish mobile subscribers. It is stored in the SIM card and can be used to distinguish valid information of mobile subscribers. GSM (Global System of Mobile communication, Global System for Mobile Communications) network generally does not use IMSI as the user's identification code on the air interface, because once the IMSI is intercepted in the air, combined with related algorithms, the user's SIM card may be cloned. Therefore, in order to avoid sending IMSI over the air interface, the network uses a Temporary Mobile Subscriber Identity (TMSI) instead of IMSI, and the TMSI will be changed periodically to meet the security and confidentiality requirements. [0003] With...

AI Technical Summary

Problems solved by technology

However, the decoding process requires all the analysis of a large amount of signaling data on the air interface, which requires a large processing capacity

In terms of implementation, at least the following costs are required: first, a dedicated wideband receiver is required to deal with the multi-channel and frequency hopping technology of the GSM network; second, an expensive GSM protocol stack is required for protocol restoration; A large amount of data requires strong FPGA processing capabilities, so the implementation cost of such decoding devices is very expensive

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