Ofufuza ochokera ku Korea Advanced Institute of Technology asindikiza zida za LTESniffer, zomwe zimakulolani kuti muzitha kumvetsera (popanda kutumiza zizindikiro pamlengalenga) kukonzekera kumvetsera ndi kusokoneza magalimoto pakati pa siteshoni yoyambira ndi foni yam'manja muzitsulo za 4G LTE. Chidachi chimapereka zofunikira pokonzekera kuthamangitsidwa kwa magalimoto ndi kukhazikitsa kwa API pakugwiritsa ntchito magwiridwe antchito a LTESniffer pamapulogalamu ena.
LTESniffer imapereka kumasulira kwa tchanelo chakuthupi PDCCH (Physical Downlink Control Channel) kuti mudziwe zambiri zamagalimoto kuchokera pamalo oyambira (DCI, Downlink Control Information) ndi zozindikiritsa netiweki zosakhalitsa (RNTI, Radio Network Temporary Identifier). Tanthauzo la DCI ndi RNTI limalolezanso kumasulira deta kuchokera ku PDSCH (Physical Downlink Shared Channel) ndi PUSCH (Physical Uplink Shared Channel) kuti mupeze mwayi wopeza magalimoto obwera ndi otuluka. Panthawi imodzimodziyo, LTESniffer sichichotsa mauthenga obisika omwe amafalitsidwa pakati pa foni yam'manja ndi siteshoni yoyambira, koma imapereka mwayi wongodziwa zomwe zimafalitsidwa momveka bwino. Mwachitsanzo, mauthenga otumizidwa ndi siteshoni yoyambira mumayendedwe owulutsa ndi mauthenga oyambira olumikizidwa amatumizidwa popanda kubisa, zomwe zimapangitsa kuti zitheke kusonkhanitsa zambiri za nambala, liti komanso nambala yomwe idayimbidwa).
Kudulira kumafuna zida zowonjezera. Kuti muchepetse kuchuluka kwa magalimoto kuchokera pamalo oyambira, cholumikizira chosinthika cha USRP B210 (SDR) chokhala ndi tinyanga ziwiri, chokwera pafupifupi $ 2000, ndichokwanira. Kuti muchepetse kuchuluka kwa magalimoto kuchokera pafoni yam'manja kupita pamalo oyambira, bolodi yokwera mtengo kwambiri ya USRP X310 SDR yokhala ndi ma transceivers awiri owonjezera (chidacho chimawononga pafupifupi $ 11000), chifukwa kununkhiza mosadukiza mapaketi otumizidwa ndi mafoni kumafuna kulumikizana kwanthawi yake pakati pa mafelemu otumizidwa ndi olandilidwa. ndi zizindikiro zolandirira panthawi imodzi m'magulu awiri osiyana siyana. Kompyuta yamphamvu yokwanira ikufunikanso kuti izindikire protocol, mwachitsanzo, kusanthula kuchuluka kwa masiteshoni omwe ali ndi ogwiritsa ntchito 150, makina a Intel i7 CPU ndi 16GB ya RAM amalimbikitsidwa.
Zina zazikulu za LTESniffer:
- Kulemba zenizeni zenizeni zamayendedwe otuluka ndi omwe akubwera a LTE (PDCCH, PDSCH, PUSCH).
- Kuthandizira kwa LTE Advanced (4G) ndi LTE Advanced Pro (5G, 256-QAM).
- Thandizo la mawonekedwe a DCI (Downlink Control Information): 0, 1A, 1, 1B, 1C, 2, 2A, 2B.
- Chithandizo chamitundu yotumizira deta: 1, 2, 3, 4.
- Thandizo la ma frequency division duplex (FDD).
- Kuthandizira masiteshoni oyambira pogwiritsa ntchito ma frequency mpaka 20 MHz.
- Kudziwikiratu kwamasinthidwe omwe amagwiritsidwa ntchito pama data omwe akubwera ndi otuluka (16QAM, 64QAM, 256QAM).
- Kudziwikiratu zoikamo zosanjikiza pa foni iliyonse.
- Thandizo la LTE Security API: RNTI-TMSI mapu, kusonkhanitsa IMSI, mbiri.
Source: opennet.ru