A shortage is a sign that somebody is keeping the price artificially lower than it would be if supply and demand were allowed to operate freely.

当每件事都是容易的时候，一个人很快的就会变的愚蠢。

密码学的艺术是使破解系统的成本超过受保护信息的价值。

自信源于内心，没有人能给你。

优化是在给定约束条件下做出最佳选择的艺术。