發送短信 : Preventing Location-Based Identity Inference in Anonymous Spatial Queries

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