Cryptography is about communication in the presence of adversaries.

人性既不是完全善良，也不是完全邪恶，而是两者兼有。

My success is because I have a good family.

我不知道我是否有哲学。我只是尽力写出最好的书。

The secret of change is to focus all of your energy not on fighting the old, but on building the new.