2016-11-03 暗号 https://ja.wikipedia.org/wiki/%E6%9A%97%E5%8F%B7#.E6.9A.97.E5.8F.B7.EF.BC.88.E3.82.B5.E3.82.A4.E3.83.95.E3.82.A1.EF.BC.89.E3.81.AE.E4.BE.8B