發送短信

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

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發送短信 : An efficient and practical scheme for privacy protection in e-commerce of digital goods