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  _____    _    _    _    _      ___    __    __  
 / ____|| | || | || | || | ||   / _ \\  \ \\ / // 
/ //---`' | || | || | || | ||  / //\ \\  \ \/ //  
\ \\___   | \\_/ || | \\_/ || |  ___  ||  \  //   
 \_____||  \____//   \____//  |_||  |_||   \//    
  `----`    `---`     `---`   `-`   `-`     `

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發送短信 : Secure wireless transmission without keys : a physical layer approach