每一代人都认为自己比前一代人更聪明，比后一代人更明智。
Every generation imagines itself to be more intelligent than the one that went before it, and wiser than the one that comes after it.
密码学是关于在存在对手的情况下进行通信的。
现代国家的特点是其能够有效地集中和使用权力。