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|      \\   / _ \\  | \  / ||  /_   _// | \  / || 
|  --  //  / //\ \\ |  \/  ||   -| ||-  |  \/  || 
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|______// |_||  |_|||_|\/|_||  /_____// |_|\/|_|| 
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發送短信 : Efficient group handover authentication for secure 5G-based communications in platoons