{"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\/sk\/blog\/news\/opublikovan-instrumentarij-ltesniffer-dlya-perehvata-trafika-v-setyah-4g-lte","title":{"rendered":"Bol vydan\u00fd n\u00e1stroj LTESniffer na zachyt\u00e1vanie prev\u00e1dzky v sie\u0165ach 4G LTE","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V\u00fdskumn\u00edci z K\u00f3rejsk\u00e9ho in\u0161tit\u00fatu pokro\u010dil\u00fdch technol\u00f3gi\u00ed zverejnili n\u00e1stroj LTESniffer, ktor\u00fd umo\u017e\u0148uje pas\u00edvne odpo\u010d\u00favanie a zachyt\u00e1vanie prev\u00e1dzky medzi z\u00e1klad\u0148ovou stanicou a mobiln\u00fdm telef\u00f3nom v sie\u0165ach 4G LTE (bez vysielania sign\u00e1lov do \u00e9teru). N\u00e1stroj poskytuje utilitky na zachyt\u00e1vanie prev\u00e1dzky a realiz\u00e1ciu API pre vyu\u017eitie funk\u010dnosti LTESniffer v extern\u00fdch aplik\u00e1ci\u00e1ch. <\/p>\n

LTESniffer zabezpe\u010duje dek\u00f3dovanie fyzick\u00e9ho kan\u00e1la PDCCH (Physical Downlink Control Channel) na z\u00edskanie inform\u00e1ci\u00ed o prev\u00e1dzke zo z\u00e1klad\u0148ovej stanice (DCI, Downlink Control Information) a do\u010dasn\u00fdch identifik\u00e1torov siete (RNTI, Radio Network Temporary Identifier). Ur\u010denie DCI a RNTI n\u00e1sledne umo\u017e\u0148uje dek\u00f3dova\u0165 d\u00e1ta z kan\u00e1lov PDSCH (Physical Downlink Shared Channel) a PUSCH (Physical Uplink Shared Channel) na pr\u00edstup k prich\u00e1dzaj\u00facej a odch\u00e1dzaj\u00facej prev\u00e1dzke. LTESniffer sa v\u0161ak nezap\u00e1ja do de\u0161ifrovania \u0161ifrovan\u00fdch spr\u00e1v pren\u00e1\u0161an\u00fdch medzi mobiln\u00fdm telef\u00f3nom a z\u00e1klad\u0148ovou stanicou, poskytuje len pr\u00edstup k inform\u00e1ci\u00e1m pren\u00e1\u0161an\u00fdm v otvorenej forme. Napr\u00edklad spr\u00e1vy posielan\u00e9 z\u00e1klad\u0148ovou stanicou v re\u017eime broadcast a po\u010diato\u010dn\u00e9 spr\u00e1vy pre pripojenie sa pren\u00e1\u0161aj\u00fa bez \u0161ifrovania, \u010do umo\u017e\u0148uje zbiera\u0165 inform\u00e1cie o tom, z ktor\u00e9ho \u010d\u00edsla, kedy a na ktor\u00e9 \u010d\u00edslo boli uskuto\u010dnen\u00e9 hovory. <\/p>\n

Na zabezpe\u010denie odpo\u010d\u00favania je potrebn\u00e9 dodato\u010dn\u00e9 vybavenie. Pre odpo\u010d\u00favanie prev\u00e1dzky iba zo z\u00e1klad\u0148ovej stanice posta\u010duje programovate\u013en\u00fd prij\u00edma\u010d\/vysiela\u010d (SDR) USRP B210 s dvoma ant\u00e9nami, ktor\u00fd stoj\u00ed pribli\u017ene 2000 dol\u00e1rov. Na odpo\u010d\u00favanie prev\u00e1dzky z mobiln\u00e9ho telef\u00f3nu do z\u00e1klad\u0148ovej stanice je potrebn\u00e1 drah\u0161ia SDR doska USRP X310 s dvoma dodato\u010dn\u00fdmi prij\u00edma\u010dmi\/vysiela\u010dmi (cena s\u00fapravy je pribli\u017ene 11000 dol\u00e1rov), preto\u017ee na pas\u00edvne sn\u00edmanie paketov odoslan\u00fdch telef\u00f3nmi vy\u017eaduje presn\u00fa synchroniz\u00e1ciu \u010dasu medzi odosielan\u00fdmi a prij\u00edman\u00fdmi r\u00e1mcami a s\u00fa\u010dasn\u00fd pr\u00edjem sign\u00e1lov v dvoch r\u00f4znych frekven\u010dn\u00fdch p\u00e1smach. Na dek\u00f3dovanie protokolu je tie\u017e potrebn\u00fd dostato\u010dne v\u00fdkonn\u00fd po\u010d\u00edta\u010d; napr\u00edklad na anal\u00fdzu prev\u00e1dzky z\u00e1klad\u0148ovej stanice s 150 akt\u00edvnymi pou\u017e\u00edvate\u013emi je doporu\u010den\u00fd syst\u00e9m CPU Intel i7 a 16 GB RAM. <\/p>\n

Hlavn\u00e9 funkcie LTESniffer: <\/p>\n