现代密码学的挑战不仅是确保通信安全，而且要以既高效又可扩展的方式实现。

It’s true that everything has its Personal Legend, but one day that Personal Legend will be realized. So each thing has to transform itself into something better, and to acquire a new Personal Legend, until, someday, the Soul of the World becomes one thing only.

要维护民族独立，必须加强民族团结。

Buying tools: Start by buying the absolute cheapest tools you can find. Upgrade the ones you use a lot. If you wind up using some tool for a job， buy the very best you can afford.

50岁重建事业并不容易——但值得的事情从来都不简单。