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

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發送短信 : Pseudo-randomness in cryptography