發送短信

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            _____      _____    _____     ______  
    ___    |  ___||   / ___//  |  ___||  /_   _// 
   /   ||  | ||__     \___ \\  | ||__    `-| |,-  
  | [] ||  | ||__     /    //  | ||__      | ||   
   \__ ||  |_____||  /____//   |_____||    |_||   
    -|_||  `-----`  `-----`    `-----`     `-`'   
     `-`

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發送短信 : Protecting Group Dynamic Information in Large Scale Multicast Groups