(We all know that programs are made up of code, and programmers are the inventors of code. Code that everyone can't understand is like a kind child to them. All the code is lifelike in their hands, but not all programmers can make your children do it right. Sometimes mistakes occur, but they can't see it. Although network security has always been highly valued, some emergencies will catch people off guard. Some countermeasures after the accident, if handled well, can reduce losses, which can also be regarded as a remedial measure. It's not too late.)