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详细说明： 获得gsm信号的指导Abstract: This paper presents current achievements of opensource community developers in the area of building GSMenabled communication hardware and software. Opensource GPL licensed software makes constant and very significant contribution to IT industry. Together with so called openhardware, it enables the cost of some expensive GSM devices, for example bugging devices used by intelligence to be lowered to the cost of raw electronic components and this can have potentially enormous influence on other branches of mobile telecommunication industry, similar to the impact opensource exerted on software development in recent years. Bugging devices can eavesdrop mobile communication based on A5/1 cryptanalysis achievements and a flaw found in GSM protocol stack. ...展开收缩
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