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             ___      _  _    __   __    ______  
  ____      / _ \\   | \| ||  \ \\/ //  /_   _// 
 |    \\   / //\ \\  |  ' ||   \ ` //   `-| |,-  
 | [] ||  |  ___  || | .  ||    | ||      | ||   
 |  __//  |_||  |_|| |_|\_||    |_||      |_||   
 |_|`-`   `-`   `-`  `-` -`     `-`'      `-`'   
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發送短信 : Secrecy gain : a wiretap lattice code design