沉默有时比言语更有力量。
Silence is sometimes more powerful than words.
The truth is often found in contradiction.
密码学的目标是使破解系统的成本超过受保护信息的价值。
Never stop learning; the day you think you know it all is the day you start falling behind.
每个人心里都有一座围城，外面的人想进去，里面的人想出来。