IMSI-catcher Identification And Location Technology Based On Mobile Terminal

IMSI-catcher is a hotspot in the field of mobile communication security.IMSI-catcher using GSM and LTE communication system security flaws to invade the mobile communication network.At present,radio management departments mainly do the prevention and treatment of IMSI-catcher,ordinary mobile users can not take the initiative to detect IMSI-catcher due to the lack of professional equipment,manpower and time.Therefore,to explore efficient,low threshold IMSI-catcher detection mechanisms for ordinary mobile users have an important significance.In this thesis,the security and defects of GSM and LTE communication system are studied and analyzed.Then the structure and working principle of the GSM and LTE IMSI-catcher are analyzed.Base on this,This paper focuses on the research of IMSI-catcher identification algorithm: improving the RSSI recognition algorithm and information consistency algorithm,putting forword LAC/CID location update algorithm,Nc list algorithm and recognition algorithm based on silent message attacks.Subsequently,to solve the IMSI-catcher location problem,the author puts forward a method of IMSI-catcher positioning via big data in mobile scene through a large number of IMSI-catcher detection data from mobile uploaded to server for mining calculation.At the same time,the mobile can also locate the IMSI-catcher using the measured data by itself.This thesis focuses on the research of IMSI-catcher positioning algorithm based on RSSI Technology: the weighted maximum likelihood estimation method,region weighted centroid algorithm and iterative weighted localization algorithm.the reliability of the three algorithms is verified through to the test of communication base station positioning in real environment.Finally,this thesis made a concrete implementation of the IMSI-catcher identification and positioning system,using C/S development model,based on mechanism presented above.This system provides a new idea for the fight against IMSI-catcher crime,making full use of public resources,moving the police work forward and letting each mobile user have the strength to participate in the work of the IMSI-catcher detection.