These walls are really interesting. At first you hate it, then you get used to it. After a considerable period of time, you will depend on it.
这些高墙还真是有点意思。一开始你恨它,然后你对它就习惯了。等相当的时间过去后,你还会依赖它。
The first idea a child gets is the most important one.
现代密码学的挑战不仅在于保护信息,而且在于以一种既高效又可扩展的方式来实现。