{"id":108534,"date":"2023-05-15T18:48:10","date_gmt":"2023-05-15T16:48:10","guid":{"rendered":"https:\/\/prohoster.info\/?p=108534"},"modified":"2023-05-16T18:21:42","modified_gmt":"2023-05-16T16:21:42","slug":"opublikovan-instrumentarij-ltesniffer-dlya-perehvata-trafika-v-setyah-4g-lte","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/opublikovan-instrumentarij-ltesniffer-dlya-perehvata-trafika-v-setyah-4g-lte","title":{"rendered":"Byl zve\u0159ejn\u011bn n\u00e1stroj LTESniffer pro odposlech provozu v s\u00edt\u00edch 4G LTE","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V\u00fdzkumn\u00edci z Korejsk\u00e9ho institutu pokro\u010dil\u00fdch technologi\u00ed publikovali n\u00e1stroj LTESniffer, kter\u00fd umo\u017e\u0148uje pasivn\u00ed sledov\u00e1n\u00ed a zachycen\u00ed provozu mezi z\u00e1kladnovou stanic\u00ed a mobiln\u00edm telefonem v s\u00edt\u00edch 4G LTE (bez vys\u00edl\u00e1n\u00ed sign\u00e1l\u016f do \u00e9teru). Tento n\u00e1stroj poskytuje utility pro organizaci zachycen\u00ed provozu a implementaci API pro vyu\u017eit\u00ed funk\u010dnosti LTESniffer v extern\u00edch aplikac\u00edch. <\/p>\n

LTESniffer zaji\u0161\u0165uje dek\u00f3dov\u00e1n\u00ed fyzick\u00e9ho kan\u00e1lu PDCCH (Physical Downlink Control Channel) pro z\u00edsk\u00e1n\u00ed informac\u00ed o provozu ze z\u00e1kladnov\u00e9 stanice (DCI, Downlink Control Information) a do\u010dasn\u00fdch identifik\u00e1tor\u016f s\u00edt\u011b (RNTI, Radio Network Temporary Identifier). Ur\u010den\u00ed DCI a RNTI d\u00e1le umo\u017e\u0148uje dek\u00f3dov\u00e1n\u00ed dat z kan\u00e1l\u016f PDSCH (Physical Downlink Shared Channel) a PUSCH (Physical Uplink Shared Channel) pro p\u0159\u00edstup k p\u0159\u00edchoz\u00edmu a odchoz\u00edmu provozu. LTESniffer se v\u0161ak nezab\u00fdv\u00e1 de\u0161ifrov\u00e1n\u00edm \u0161ifrovan\u00fdch zpr\u00e1v p\u0159en\u00e1\u0161en\u00fdch mezi mobiln\u00edm telefonem a z\u00e1kladnovou stanic\u00ed, ale poskytuje p\u0159\u00edstup pouze k informac\u00edm p\u0159en\u00e1\u0161en\u00fdm v otev\u0159en\u00e9 podob\u011b. Nap\u0159\u00edklad se bez \u0161ifrov\u00e1n\u00ed p\u0159en\u00e1\u0161ej\u00ed zpr\u00e1vy odes\u00edlan\u00e9 z\u00e1kladnovou stanic\u00ed v re\u017eimu vys\u00edl\u00e1n\u00ed a po\u010d\u00e1te\u010dn\u00ed zpr\u00e1vy o p\u0159ipojen\u00ed, co\u017e umo\u017e\u0148uje sb\u00edrat informace o tom, z jak\u00e9ho \u010d\u00edsla, kdy a na jak\u00e9 \u010d\u00edslo byly uskute\u010dn\u011bny hovory. <\/p>\n

Pro organizaci zachycen\u00ed je nutn\u00e9 dal\u0161\u00ed za\u0159\u00edzen\u00ed. Pro zachycen\u00ed provozu pouze ze z\u00e1kladnov\u00e9 stanice sta\u010d\u00ed programovateln\u00fd p\u0159ij\u00edma\u010d a vys\u00edla\u010d (SDR) USRP B210 se dv\u011bma ant\u00e9nami, kter\u00fd stoj\u00ed p\u0159ibli\u017en\u011b 2000 $. Pro zachycen\u00ed provozu od mobiln\u00edho telefonu k z\u00e1kladnov\u00e9 stanici je t\u0159eba dra\u017e\u0161\u00ed SDR deska USRP X310 se dv\u011bma dodate\u010dn\u00fdmi p\u0159ij\u00edma\u010di a vys\u00edla\u010di (cena sady p\u0159ibli\u017en\u011b 11000 $), proto\u017ee pro pasivn\u00ed sniffering bal\u00ed\u010dk\u016f odes\u00edlan\u00fdch telefony je vy\u017eadov\u00e1na p\u0159esn\u00e1 \u010dasov\u00e1 synchronizace mezi odes\u00edlan\u00fdmi a p\u0159ij\u00edman\u00fdmi r\u00e1my spolu s sou\u010dasn\u00fdm p\u0159\u00edjmem sign\u00e1l\u016f ve dvou r\u016fzn\u00fdch frekven\u010dn\u00edch p\u00e1smech. Pro dek\u00f3dov\u00e1n\u00ed protokolu je tak\u00e9 pot\u0159eba dostate\u010dn\u011b v\u00fdkonn\u00fd po\u010d\u00edta\u010d, nap\u0159\u00edklad pro anal\u00fdzu provozu z\u00e1kladnov\u00e9 stanice se 150 aktivn\u00edmi u\u017eivateli se doporu\u010duje syst\u00e9m s procesorem Intel i7 a 16 GB RAM. <\/p>\n

Hlavn\u00ed funkce LTESniffer: <\/p>\n