The challenge of modern cryptography is not just to protect information, but to do so in a way that is both efficient and scalable.
The time of life is limited and unchangeable, so it is necessary to use every minute efficiently. Not using it well is a waste.
语出西汉·桓宽《盐铁论·疾贪》。表:古代测量日影以计时的标杆。要想让影子正,就要先将标杆树直;要想让下面的人清廉,就要先自己做到清廉。说明上位是下位的表率。