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。

The only thing standing between you and your goal is the story you keep telling yourself as to why you can’t achieve it.

译文：要成就大事，不应该去和众人谋划。

【大意】一定要等到西施、毛嫱那样的美女作配偶，那么就终身不能成家了。

The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion.

世界上充满了微小的善意，只要你知道在哪里寻找。