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

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發送短信 : Pseudo-randomness in cryptography