ÅÃká se, a mezi uživateli výpoÄetnà techniky se velmi rychle Å¡ÃÅà názor, že pokud chceme mÃt jistotu, že náš poÄÃtaÄ nenapadnou žádné viry a hackeÅi, musÃme se pohybovat v režimu OF-LINE. Pokud je Váš poÄÃtaÄ pÅipojen k sÃti pÅes Bluetooth, Wi-Fi nebo klasický internet, může být ohrožen krádežemi dat, viry, hackery nebo staženÃm nÄkterých komponent.
MusÃme si vÅ¡ak uvÄdomit, že i dobÅe zabezpeÄený poÄÃtaÄ bez pÅipojenà k internetu, tedy v režimu OF-LINE, může být cÃlem útoku a napadenÃ. ZajÃmavé ÅeÅ¡enà tohoto problému naÅ¡li tÅi vÄdci z izraelské university. Zjistili, že lze software pod oznaÄenÃm USBee zabudovat do bÄžných USB zaÅÃzenà a poté z infikovaných zaÅÃzenà bezdrátovÄ pÅenášet data.
NebezpeÄný software USBee:
– Vlastnà funkce je založena na pÅenosu elektromagnetických signálů.
– Aby bylo možné tyto signály zaznamenat a analyzovat, potÅebuje druhý poÄÃtaÄ pouze výkonnou anténu a ty správné funkÄnà nástroje.
– Tento způsob útoku umožÅuje pÅenést až 80 bajtů za sekundu, v závislosti na typu USB zaÅÃzenÃ, který software využÃvá.
– NapÅÃklad bÄžný USB flash disk umožnuje tento pÅenos na vzdálenost necelé tÅi metry. Pokud je zaÅÃzenà pÅipojeno prostÅednictvÃm kabelu, který lze použÃt jako anténu, pak se zvyÅ¡uje dosah pÅenosu až na osm metrů.
– I pÅes tuto, vÃÅ¡e popsanou možnost, nenà pravdÄpodobné, že by se USBee nÄjak nekontrolovatelnÄ Å¡ÃÅil. PrvnÃm krokem je totiž nutnost infikovat poÄÃtaÄ, který nenà pÅipojen k sÃti a v praxi to vyžaduje obrovské úsilà a dlouhodobé plánovánÃ.
– USBee napÅÃklad dokáže použÃt kabel z USB klávesnice nebo myÅ¡i pro pÅenos pÅÃstupových údajů do pÅipravené pÅijÃmacà antény druhého poÄÃtaÄe.
Z výše uvedených poznatků tedy vyplývá, že pomocà USBee mohou být teoreticky ohroženy i systémy, které jsou považovány za zcela bezpeÄné.
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