"Please look at this roadmap. The basic security technologies are divided into cryptography, penetration testing, binary security, web security, etc. Our first lecture is the principles of common web vulnerabilities."

Shen Jiayi, very skillfully magnified the mind map and asked in confusion: "What are the common web vulnerabilities?"

"I have summarized the top ten common web vulnerabilities, namely SQL injection, cross-site scripting, cross-site request CSRF, invalid identity card and session management, etc. Each of our lectures will include a common type of vulnerability. Let's look at the first one."

"The common method used by the largest hackers now, SQL injection, is widely used to illegally obtain website control, and is a security vulnerability that occurs on the database layer of an application."

"When designing the program, we ignore the checking of the SQL instructions contained in the input string, and the database is mistakenly considered to be normal SQL instructions and run, thus causing the database to be attacked."

"It may lead to theft, change, deleted data, and further lead to the website being embedded with malicious code and implanted with backdoor programs."

Shen Jiayi asked tentatively: "Can you be more vivid?"

Problems outside the script.

Liu Cheng smiled and said, "SQL injection is equivalent to holding a lock-opening tool (vulnerability scanning tool). You need to get a key and open your door, which is probably the case."

Shen Jiayi scratched her head, and her master was never stumped by any of her problems.

"Master, you are so amazing. You can make complicated things lively and easily understandable." Shen Jiayi said in a respectful tone: "I will understand it if I said this earlier."

Liu Cheng held his forehead: "When recording videos, don't ovulate, I cut this part when editing."

"Hmph! No cut."

"Record the video well."

"What are the types of SQL injection?"

...

After Liu Cheng finished recording the video, he found that it was time out again. When Shen Jiayi was recording the video, she always liked to ask questions and ask questions in the east, like a curious kitten.

Swamp Striker: [Those big touches that can bring projects are cold every day, exuding a smell of not entering the newborn! It is not as good as a master at all!]

"Aren't I a stranger, don't go in, do I look like a zombie face? I usually do you have a lot of harshness on you. Why are you afraid of them? Not afraid of me?" Liu Cheng sighed.

Is this girl crazy?

Swamp Striker: [The master is so cruel to me, I am also good for my own good. I know that my master is the best for me! I will not chat anymore, I will go to edit the video!]

Shen Jiayi turned off QQ directly, and her heart was beating pounding.

Of course she knew that doing this was wrong, especially making jokes with Liu Cheng, which was completely immoral because her master had a girlfriend.

She knew clearly, but how could she bear it?

She didn't want to appear next to Liu Cheng just on the Internet.

I had to reject the offer from a large factory and go to find him, but today I suddenly appeared in front of Liu Cheng, which is the case.

"Oh! No matter what, no matter what, cut the video! Cut the video first!" She lay on the bed, rolling around on the bed, and began to cut the video with her messy hair.

This time, she chose to rebel and did not listen to Liu Cheng's words and reduced that part.

Instead, he left behind his obsession with Liu Cheng.

Anyone who has watched the video knows that she is greedy for Liu Cheng, whether it is technical or human.

Little greedy cat.

Liu Cheng turned off the monitor and stretched.

Liu Yinuo curled his lips and said indifferently: "There is Chen Wanruo on the left and the other one on the right. Good guy, there is another Shen Jiayi here. Let me ask you, do you have so many legs, do you step on three boats?"

Liu Cheng smacked his lips. No matter how you say this, it doesn’t taste the right thing.

"What are you thinking about?" Liu Yinuo smashed the backrest in his hand on Liu Cheng.

Liu Cheng caught the pillow and said with a smile: "Shen Jiayi is just Mu Qiang's mind."

"When she is more skilled, she will no longer admire me. At that time, she will face this relationship and then let it go."

"When I think about it again, I just smile. Don't worry, my good sister."

"Do you mean her skills are better than you?" Liu Yinuo asked blankly: "Do you think there is that possible?"

Good question.

Liu Cheng nodded and said, "That's difficult. I'm growing too. My teachers are all famous teachers in Qingze, and I'm growing constantly in practice. It's too difficult for her to surpass me."

He finished his day's work and came to campus again, riding an electric bike on campus and walking around casually.

The weather is slowly getting colder, and autumn in the capital is earlier than that in Jinan.

The oak tree gave up its resistance and allowed the autumn wind to dye the yellow leaves. The western mountain not far away was already dyed red by maple leaves, and the autumn was full of autumn.

After class, the three brothers in the dormitory found Liu Cheng.

"Brother Cheng." Wang Keran's face was not good. He said with a little hesitation: "I want to ask you something."

Liu Cheng took out his phone and made an appointment with Li Man to have a meal. He smiled and said, "Let's go, eat and talk."

"This is Wang Keran, this is Jia Jun, the person in my dormitory." Liu Cheng briefly introduced the two.

"Sister-in-law." Wang Keran is a lively person. He took the lead and called him sister-in-law. Anyway, in the dormitory, the same is true for everyone's daily names.

Li Man felt that the cells in his body were bubbled.

She had heard someone called Chen Wanruo's sister-in-law, and she felt very uncomfortable, but that was that Chen Wanruo and Liu Cheng were lovers, and she could only feel uncomfortable, but she couldn't do anything.

Now, she suddenly heard someone called her sister-in-law and suddenly realized that she felt this way.

Very awesome!

"Why are you giggling?" Liu Cheng looked at Li Man curiously and kept poking the noodles, almost as if the bowl was broken.

Li Man shook her hair and said with a smile: "It's nothing, it's just that I'm so beautiful, do you care about it?"

Ho, woman.

"Okay, Wang Keran, tell me, what's wrong?" Liu Cheng asked about the serious matter.

When was the golden age of life?

Twenty-one is a golden age for a person. At this time, people always feel that they will continue to grow vigorously and cannot beat themselves up in anything.

If it weren't for the hardship, Wang Keran would never have asked for help easily.

The arrogance of this age is even higher than that of the sky.

Liu Cheng likes Wang Keran's arrogance that is higher than the sky very much. He glares at whoever he doesn't like him and chases him whoever he likes.

He has lost this ability. To be precise, the so-called adult sleekness has left him without the sharpness that young people should have.

It's so good to be young.

"My girlfriend, Brother Cheng knows, just the one with the little medicine bottle before." Wang Keran took a deep breath and told her story.

The girl's name is Shen Rou. She is a very well-behaved girl with good studies and strong character. But God is fair, giving her all the beauty and taking away her health.

He was weak when he was young. Later, he was diagnosed with abnormal liver function. Hepatitis C was found to be an infectious disease and requires long-term use of blocking drugs.

"I don't know what to do. She doesn't let me hold her hands, don't let us have close contact, and even refuses to hug her because she is afraid of spreading it to me. I don't know how to do it." Wang Keran's expression was a little painful.

Liu Cheng said with a smile: "Actually, before you asked me, I already had the answer in my heart."

"Ah?" Wang Keran raised his head and looked a little confused.

"If you just play with it, you will naturally stay away from her illness. Life is all your own preciousness. But look at you, this serious and entangled look, are you playing with it?" Liu Cheng put some vinegar in his bowl.

Wang Keran looks unreliable, but he is quite reliable.

"Oh." Wang Keran scratched his head. Although he was still a little confused, he had already fully understood himself.
Chapter completed!