http://www.amnesty.org/en/news/new-tool-spy-victims-detect-government-surveillance-2014-11-20

http://chehbi.com/blog/2013/09/26/%D8%A7%D9%84%D9%84%D8%BA%D8%A9-%D8%A7%D9%84%D8%B9%D8%B1%D8%A8%D9%8A%D8%A9-%D8%A7%D9%84%D8%A3%D8%B3%D8%B1%D8%B9-%D9%86%D9%85%D9%88%D8%A7%D9%8B-%D9%88-%D8%A7%D9%84%D9%85%D8%BA%D8%B1%D8%A8-%D8%A7%D9%84/