Abacwaningi abavela e-Korea Advanced Institute of Technology bashicilele ikhithi yamathuluzi ye-LTESniffer, ekuvumela ukuthi ungenzi lutho (ngaphandle kokuthumela amasignali emoyeni) uhlele ukulalela nokuvimba ithrafikhi phakathi kwesiteshi esiyisisekelo nomakhalekhukhwini kumanethiwekhi e-4G LTE. Ikhithi yamathuluzi ihlinzeka ngezinsiza zokuhlela ukuvinjwa kwethrafikhi kanye nokusebenzisa i-API yokusebenzisa ukusebenza kwe-LTESniffer ezinhlelweni zezinkampani zangaphandle.
I-LTESniffer ihlinzeka ngokuqoshwa kwesiteshi esiphathekayo se-PDCCH (i-Physical Downlink Control Channel) ukuze kutholwe ulwazi mayelana nethrafikhi evela esiteshini esiyisisekelo (i-DCI, Ulwazi Lokulawula I-Downlink) nezihlonzi zenethiwekhi zesikhashana (i-RNTI, Isihlonzi Sesikhashana Se-Radio Network). Incazelo ye-DCI ne-RNTI iphinde ivumele ukuqoshwa kwedatha evela eziteshini ze-PDSCH (Physical Downlink Shared Channel) kanye ne-PUSCH (Physical Uplink Shared Channel) ukuze uthole ukufinyelela kuthrafikhi engenayo nephumayo. Ngesikhathi esifanayo, i-LTESniffer ayikhiphi imilayezo ebethelwe edluliswa phakathi kweselula nesiteshi esiyisisekelo, kodwa inikeza ukufinyelela kuphela olwazini oludluliswa ngombhalo ocacile. Isibonelo, imilayezo ethunyelwe yisiteshi sesisekelo kwimodi yokusakaza kanye nemilayezo yokuqala yokuxhumana idluliselwa ngaphandle kokubethela, okwenza kube lula ukuqoqa ulwazi mayelana nokuthi iyiphi inombolo, nini futhi iyiphi inombolo okwakukhona kuyo izingcingo).
Ukunqamula kudinga okokusebenza okwengeziwe. Ukunqamula ithrafikhi kuphela esiteshini esiyisisekelo, i-USRP B210 programmable transceiver (SDR) enezimpondo ezimbili, ebiza cishe u-$2000, yanele. Ukuze kunqandwe ithrafikhi esuka kumakhalekhukhwini ukuya esiteshini esiyisisekelo, ibhodi elibiza kakhulu le-USRP X310 SDR elinama-transceiver amabili engeziwe (ikhithi ibiza cishe u-$11000) iyadingeka, njengoba ukuhogela okungahleliwe kwamaphakethe athunyelwe izingcingo kudinga ukuvumelanisa isikhathi esinembile phakathi kwamafreyimu athunyelwe nawamukelwe. kanye namasignali okwamukela ngesikhathi esisodwa kumabhendi amabili ahlukene wefrikhwensi. Ikhompuyutha enamandla ngokwanele nayo iyadingeka ukuze kuqondwe umthetho olandelwayo, isibonelo, ukuhlaziya ithrafikhi yesiteshi esiyisisekelo esinabasebenzisi abasebenzayo abangu-150, kunconyiwe uhlelo lwe-Intel i7 CPU kanye no-16GB we-RAM.
Izici eziyinhloko ze-LTESniffer:
- Ukukhishwa kwekhodi kwesikhathi sangempela kweziteshi zokulawula ze-LTE eziphumayo nezingenayo (PDCCH, PDSCH, PUSCH).
- Usekelo lwezicaciso ze-LTE Advanced (4G) ne-LTE Advanced Pro (5G, 256-QAM).
- Usekelo lwamafomethi e-DCI (Downlink Control Information): 0, 1A, 1, 1B, 1C, 2, 2A, 2B.
- Ukusekelwa kwamamodi okudlulisa idatha: 1, 2, 3, 4.
- Ukusekela iziteshi ze-frequency division duplex (FDD).
- Ukusekelwa kweziteshi eziyisisekelo ezisebenzisa amafrikhwensi afika ku-20 MHz.
- Ukutholwa okuzenzakalelayo kwezikimu zokuguquguquka ezisetshenzisiwe zedatha engenayo nephumayo (16QAM, 64QAM, 256QAM).
- Ukutholwa okuzenzakalelayo kwezilungiselelo zesendlalelo esibonakalayo sefoni ngayinye.
- Usekelo lwe-LTE Security API: Imephu ye-RNTI-TMSI, iqoqo le-IMSI, ukwenza iphrofayela.
Source: opennet.ru