{"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\/et\/blog\/novosti-interneta\/opublikovan-instrumentarij-ltesniffer-dlya-perehvata-trafika-v-setyah-4g-lte","title":{"rendered":"On avaldatud t\u00f6\u00f6riist LTESniffer, mis v\u00f5imaldab j\u00e4lgida liiklust 4G LTE v\u00f5rkudes.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"
Korea T\u00e4iustatud Tehnoloogiate Instituudi teadlased on avaldanud LTESnifferi t\u00f6\u00f6riistakomplekti, mis v\u00f5imaldab passiivset kuulamist ja liikluse p\u00fc\u00fcdmist 4G LTE v\u00f5rkudes, ilma signaalide edastamiseta. T\u00f6\u00f6riistakomplekt pakub t\u00f6\u00f6riistu liikluse p\u00fc\u00fcdmiseks ja API rakendamiseks LTESnifferi funktsionaalsuse kasutamiseks kolmandate osapoolte rakendustes. <\/p>\n
LTESniffer tagab dekodeerimise f\u00fc\u00fcsilise kanali PDCCH (Physical Downlink Control Channel) l\u00e4bi, et saada teavet liiklusest baasjaamalt (DCI, Downlink Control Information) ja ajutistest v\u00f5rgu identifikaatoritest (RNTI, Radio Network Temporary Identifier). DCI ja RNTI m\u00e4\u00e4ramine v\u00f5imaldab edaspidi dekodeerida andmeid PDSCH (Physical Downlink Shared Channel) ja PUSCH (Physical Uplink Shared Channel) kanalitest, et p\u00e4\u00e4seda juurde sisenemisele ja v\u00e4ljuvale liiklusele. Selle k\u00e4igus LTESniffer ei tegele loodud s\u00f5numite de\u0161ifreerimisega, mis edastatakse mobiiltelefoni ja baasjaama vahel, vaid pakub juurdep\u00e4\u00e4su ainult avatud kujul edastatavale teabele. N\u00e4iteks edastatakse kr\u00fcpteerimata s\u00f5numid, mis saadetakse baasjaama kaudu ringh\u00e4\u00e4lingure\u017eiimis, ja \u00fchenduse algs\u00f5numid, mis v\u00f5imaldab koguda teavet selle kohta, kellelt numbrilt, millal ja millisele numbrile k\u00f5nesid tehti. <\/p>\n
Rohkem liiklust tabamiseks on vajalik lisavarustus. Liiklust lihtsalt baasjaama \u00fcmber p\u00fc\u00fcda on piisav programmeeritav vastuv\u00f5tja-saatja (SDR) USRP B210 koos kahe antenniga, mille hind on umbes 2000 dollarit. However, mobile phone traffic interception requires a more expensive SDR board USRP X310 with two additional transceivers (the set costs around $11,000) as passive sniffing of packets sent by phones requires precise time synchronization between sent and received frames, along with simultaneous reception of signals in two different frequency bands. A sufficiently powerful computer is also required for protocol decoding; for example, for analyzing base station traffic with 150 active users, a system with an Intel i7 CPU and 16GB of RAM is recommended. <\/p>\n