Riding the wind of rebirth

"Come on, come on," Feng Xueshan came over at the right time, carrying a small stove with barbecue charcoal already placed inside and an iron net on top. Zhou Zhi's backpack was on her back. "If you want to bicker, I'd like to lend a hand."

Mai Xiaomiao put her foot down, but Feng Xueshan looked at her and said, "I didn't say you."

Zhou Zhi obediently stood up and took the stove from Feng Xueshan, set it up, took off his schoolbag, opened it, and took out a bag of bamboo sticks wrapped in a plastic bag from it: "This is a specialty of Liangshan Prefecture, you can't eat it outside the autonomous prefecture. I now know a few wild hot springs in the mountains. When you come to Lianhe Township to play, I will take you there."

"No, the ultraviolet rays are too strong for me to bear." Feng Xueshan refused without even raising her head, took the skewer Zhou Zhi handed over and put it on the iron net to heat it: "I'm not as thick-skinned as you."

Feng Xueshan's skin is indeed rare among girls. Maybe she can't withstand the strong ultraviolet rays in the autonomous prefecture. Zhou Zhi really didn't think of this: "That's true. The ultraviolet rays in the prefecture are indeed too strong, but it's not without benefits. At least the fruits grow well. Hey, what's this in the bag..."

"Give it back to me!" Mai Xiaomiao was immediately excited when she saw the folder Zhou Zhi took out of his hand.

"What is this..." Zhou Zhi ran to the side with the folder and signaled Feng Xueshan to stop Mai Xiaomiao. He opened the folder and found the words "Four-Leaf Clover System Cluster Security Improvement Plan" written on the cover. However, before he read the content, he was very angry at the picture below the text.

Below the words "improvement plan", there is a picture of a pork elbow on a plate, with a cartoon-style pig head on the side, and six words written on the side: "Big pork elbow, stupid pig head!"

"That's too much!" Zhou Zhi showed the page in the folder: "Isn't this considered a personal attack?"

Feng Xueshan finally smiled when she saw the painting: "I went into her room before and found the window was open. The person was gone, and there was this on the table."

Mai Xiaomiao had already slipped back into her chair and covered her face with her hands in shame.

Zhou Zhi turned over the title page and after reading a few pages, he discovered the important value of this information.

Clover Group is a technology company. In order to achieve efficient communication between departments and streamlined human resources, its reliance on information systems can be said to have started before the group was founded.

As an engineering management talent, Zhou Zhi was very adept at designing system architecture and his considerations were very comprehensive. However, he made a big mistake - he adopted too many conventional solutions that seemed ordinary in later generations, but ignored the fact that such an advanced system, in this era when computer networks were just starting out, would encounter many problems of mismatch between "productive forces and production relations."

Although all members of the Clover Group were ambitious and used various methods to develop many new supporting products in order to finally realize the grand plan of Zhouzhi, their main energy was focused on "how to achieve it" and they were unable to devote too much energy to many details.

For all those who visited the Clover Group, they were extremely envious of how Clover was able to complete product research and development, human resources management, financial management, sales management, statistics, tracking, inventory management, and even employee wages, benefits, attendance, and consumption in various internal consumption venues in its large-scale integrated system, all of which could be centrally managed.

Not only is the efficiency extremely high, but all kinds of statistical reports, supervision and verification needed by the entire group can be used extremely conveniently, which can be regarded as a multiplier of corporate efficiency and profits.

Such a large group certainly cannot rely on only one system to complete these tasks. It can only complete various tasks through modularization, and then complete data sharing between modules through relevant interfaces.

Therefore, Mai Xiaomiao's naming of the big system of Siyecao is quite accurate - system cluster. Other enterprises lack even single-function systems, let alone clusters. The country is still vigorously calling on enterprises, institutions and government agencies at all levels to realize informatization as soon as possible, get rid of paper and pen, and even dare not mention networking.

Therefore, Clover's system cluster has always been visited, appreciated, and praised as one of the model benchmarks of modern enterprises. It is the object of everyone's admiration and envy. It can even be said that it is one of the few achievements in China that can be proudly shown to Westerners. Therefore, almost no one sees the other side of the matter and criticizes it from the opposite side.

Mai Xiaomiao proved through his own practice that the Clover system cluster does have huge hidden dangers, and proposed solutions from a theoretical perspective. He also compiled a security improvement plan and attached two paintings.

This proposal is quite scientific and feasible.

The plan is divided into three levels. The primary level is to make some vulnerability patches on the existing basis, including the firewall level, operating system level, and application system level. All three levels need to be re-attacked, various security measures must be upgraded, and various bugs must be fixed, including the empty instruction sled bug that Mai Xiaomiao used for the attack himself.

In fact, it is very simple to eliminate this problem. The basis of the sled attack is actually stack overflow. It can be solved by simply checking the length of the input and output information entering the stack and preventing the stack from overflowing.

Most of the system vulnerabilities are like this. This is mainly because the huge size of the system makes BUGs inevitable. Once they are discovered, it is very easy to plug them.

The intermediate solution is to improve the integration and standardization of system clusters and eliminate illogical system settings such as "visitors with high permissions".

This requires a very sophisticated algorithm to perform a comprehensive diagnosis of the system cluster, which is very difficult to implement.

This is because you need to teach the diagnostic program the basic constraint operating logic for all permissions, roles, and users in the system. When the system becomes complex to the level of a "cluster," the interweaving and interactions between the various systems will make this matter extremely complicated and confusing.

There is also a lot of erroneous logic mixed in here. The diagnostic program needs to diagnose whether it is correct or wrong among such a large and tangled logical relationship. This is beyond Zhou Zhi's current academic level.

Of course, he knew that there would be solutions in the future, such as artificial intelligence and learning functions, which would allow the diagnostic program to iterate in the process of continuous learning and ultimately meet the requirements.

However, this plan is far from the current level of world information technology.

The solution proposed by Mai Xiaomiao is actually similar to the later solution, but the diagnostic model she proposed is much simpler. It uses the now developed nonlinear optimization theory to develop a diagnostic model, allowing the diagnostic model to sort out the logical relationship in this system cluster, and then let a large number of people participate in it, telling the diagnostic model whether this is correct logic or incorrect logic, and telling the diagnostic model where such logical errors are. Ultimately, the diagnostic model can continuously correct the results and achieve a satisfactory error detection rate.

This is actually a forced intermediate alternative solution, which is to decompose complex nonlinear problems into a set of relatively simple linear problems, and finally combine the answers to this set of linear problems to approximate the answer to the nonlinear problem.

This approach means that the answer can never be the ultimate answer to a true nonlinear problem, but it can be infinitely close. In engineering, this problem is actually solved.

Mai Xiaomiao's intelligence can be seen from this incident alone, so she insisted that she was a big-elbowed stupid pig, and Zhou Zhi had no choice but to accept it. (End of this chapter)