The past is always changing. Every time we remember something, we alter it slightly, until eventually, our memories become stories we tell ourselves.

密码学中的挑战不仅仅是创建不可破解的代码，还包括创建即使技术发展也能保持安全的系统。

History is a nightmare from which I am trying to awake.

发愤研究学问，常常忘记吃饭，一旦有所收获便又高兴地忘记了忧愁，连自己的渐趋衰老也没有感觉到。