密码学的目标是使破解系统的成本超过受保护信息的价值。
The goal of cryptography is to make it so that the cost of breaking the system exceeds the value of the information protected.
写作就是生活，生活就是写作。
相信你的根基，但不要害怕拓展新枝。
"The only thing we have to fear is fear itself."
I know that self-promotion happens a lot and it is not a bad thing. But I do not regard it as something positive.