Moiré pattern, this word should be familiar to some people.

Pick up the mobile phone, turn on the camera, and look at the TV and computer monitor screen, and the pattern that changes like a water snake and the rings of a big tree is the so-called moiré pattern.

If you want to talk about the principle, Liu Lang doesn't understand it, that is, the image sensor in the camera equipment is due to the high-frequency interference generated by the light source, so this moiré phenomenon will appear.

If you want to say this email, in fact, the reply is not careful, only three words, people who don't know think it is perfunctory, but Liu Lang seems to see hope, as if he is puzzled, and suddenly learned a trick.

And that trick is moiré patterns.

It seems that Liu Lang guessed correctly at the beginning, the ironclad video provided by Ouyang Qianqian, the problem is not at the technical level at all.

This time, after Liu Lang opened the video, he watched it several times and finally found the problem.

At 1 minute and 36 seconds into the video, he found that there was a moiré pattern in the lower left corner of the screen, not the lower right corner of the screen to be exact, but the lower right corner of the video content, which almost flashed by without any staying time.

The same happened at 1:48 and 2:03.

This is a very subtle detail, neither Liu Lang nor the previous technicians of Wanliyun Technology found it, and this so-called melon-eating master actually found it, Liu Lang had to sigh, but he didn't know what to sigh about, first of all, the identity of this melon-eating master, is it Shen Mengjie's friend?

Otherwise, how would he know Shen Mengjie's mailbox, but I think the content of his letter should be the first time to send an email to Shen Mengjie, and if he Mengjie hires him as a senior security consultant of Wanliyun Technology for 500,000 yuan, the price will inevitably be too small.

You must know that if the ironclad evidence provided by Ouyang Qianqian can be overturned, then it can reduce Shen Wanjie's losses by at least tens of billions.

For a while, Liu Lang didn't know whether this melon-eating master was stupid or stupid, or wise and stupid.

Looking back at the moiré pattern phenomenon in these three places, it stands to reason that it is impossible not to find it, but the problem is here, the time is too short, it flashes, and the video screen is extremely unclear, and no one notices.

In addition, the attention of the people watching this video is on the picture and audio, who has the time to see that the moiré pattern suddenly appears in the lower right corner.

In fact, the main problem is that after Ouyang Qianqian provided this video, she argued that she put her mobile phone in the shopping bag of the supermarket at that time, so the camera could only shoot the picture through that layer of plastic paper, so the picture content and audio sound can only do this.

But now it seems that this is not the case, although there are no problems with the video files and audio, they are all straight out, but this moiré pattern betrays Ouyang Qianqian.

In this case, it can only mean that the video file was obtained by shooting the screen on the mobile phone, and because the content of the picture is indeed separated by a transparent plastic bag, it is blurry, and only a man and a woman can be vaguely seen.

But there is no problem with audio detection, the voices of men and women are indeed Shen Wanjie and Ouyang Qianqian, so Liu Lang boldly guessed that Ouyang Qianqian recorded her and Shen Wanjie's voices, and later synthesized them into this video, and then filmed them through his mobile phone.

Since the sensor of the mobile phone camera is limited by the size, the suppression of moiré is really limited, so this moiré phenomenon is unavoidable.

After the filming is completed, post-processing cannot be carried out, otherwise it cannot be presented as evidence.

So this should be a version with less moiré patterns. Liu Lang guessed that Ouyang Qianqian should have filmed many versions before she found such a perfect version.

"Yes, this woman is very scheming and has enough brains."

Liu Lang couldn't help but sigh that the magic was one foot high, and the road was one foot high, and the mysterious melon-eating master in the email had discovered a blind spot that no one had discovered.

Subsequently, Liu Lang replied to an email.

[I hacked into the personnel system by myself, send an office, fill in the position casually, and I am not Miss Shen, I am Mr. Liu, Mr. Liu of the Prodigal Son Group. 】

After sending this email, Liu Lang left Shen Mengjie's office with a USB flash drive.

Now that the problem has been solved, you can wait for the trial, and the next court session will be in the morning after tomorrow, and Zheng Guang, as Shen Wanjie's lawyer, has the right to request an early trial.

But in order not to make Ouyang Qianqian suspicious, Liu Lang decided to wait patiently, not only to wait, but also to make Zheng Guang late in the end, only then would Ouyang Qianqian and the opposing lawyer let down their vigilance.

But it was not without things to do in the past two days, after Liu Lang left Wanliyun, he called Shen Mengjie, asked her to meet, and by the way, told all the things that happened in the dark room just now.

"Master of melon eating?"

Obviously, Shen Mengjie was stunned for a moment: "The last time Wan Jie told you that the server was invaded, but there was no loss, the signature left on the footprints was the master of eating melons." ”

Hearing Shen Mengjie say this, Liu Lang realized that it seemed that the fate of this melon-eating master and Wanliyun had already begun.

"That's capability, I read the first email he sent, it's all logical interfaces, this level should be difficult to find in the world, right?"

Hearing Liu Lang say this, Shen Mengjie snorted: "Indeed, Wanliyun has provided tens of millions of dollars internationally to invite hackers from all over the world to attack Wanliyun's suspended sandbox system, but no one has broken it. ”

"Of course, this does not mean that the security logic of Wanliyun is very high." Shen Mengjie explained: "It can only be said that tens of millions of dollars cannot invite hackers who can break Wanliyun Technology to come forward. ”

"Later, the day after the event, our server was compromised, and the hacker left a mocking word like ''ahahaha' on our intranet homepage, and we then contacted the person, hoping to recruit An, but unfortunately the hacker has disappeared for hours, even if the footprints on the server have not been erased, but no one can be found."

Liu Lang didn't know that Wanliyun Technology still had such a past, which sounded quite suspenseful.

"Then what do you think of this melon-eating master?" Liu Lang asked.

After all, Wanliyun Technology belongs to Shen Mengjie, so Liu Lang wanted to ask Shen Mengjie's opinion, although he sent all the emails to others, some of them were overstepping.

Shen Mengjie didn't say anything, and directly said that she listened to Liu Lang for this kind of thing, and said that after the last incident, Wan Jie wanted to follow Liu Lang's method to recruit An, the master of eating melons, but he didn't expect that he couldn't contact anyone at all.

"A computer master of this level, the contact information should be hidden in your affected server through various ciphers, it is estimated that Wan Jie did not pay attention to this, but the master of eating melons should have already targeted you, this time he helped you, as for what his purpose is, it is unknown."

"What do you mean, sir?" Shen Mengjie asked.

Liu Lang didn't answer, but asked rhetorically: "If the logical interface of your system has been deciphered by him, then it stands to reason that Wanliyun's servers are already in his hands, right?" ”

Shen Mengjie didn't react to why Liu Lang asked this, but still nodded and said, "That's right, he can enter and exit without our knowledge, and the access rights of the entire system have been rewritten by him." ”

"And can your engineers keep him out?"

"Yes, it just takes a little time, but his skills are a lot higher than the technicians on our side, and even if we rewrite this permission again, it won't be long before he can break in again."

After hearing Shen Mengjie say this, Liu Lang no longer hesitated: "Since this is the case, there is nothing to say, let's recruit directly, the technology company is targeted by hackers, that's how it is." ”

Shen Mengjie hummed, and then called personnel and asked them to monitor the company's email system, and once they found that it was not operated by humans, they would report it immediately.

Being able to overturn this ironclad video, Shen Mengjie's heart was also relieved.

Liu Lang was not idle, he took Shen Mengjie and Bai Lan to meet, after all, Bai Lan will be appointed as the president of Wanliyun Technology in the next two days, and Shen Mengjie will also be the chairman of Wanliyun Technology in the future.

When the court was held on the third day, Shen Mengjie told Liu Lang that he had not received a reply from Master Melon-Eating in the past two days, and there was no abnormal non-human email sent out by the company's email system, which means that Master Melon-eating did not send office to himself from the personnel system of Wanliyun Technology.

"Could this be a trap?" Shen Mengjie asked: "If this foodie master has already done a good job in the video file, then ...... today?"

Liu Lang knew what Shen Mengjie was thinking, after all, although she had communicated with the situation in advance, the only point of communication was the three places where moiré patterns appeared in the video, and there was no progress in their investigation other than that, which means that today's turnover all depends on this moiré pattern.

But if the melon eater deliberately made trouble and secretly modified the video source file, it would be hard to say.

At present, Liu Lang only knows three copies of this document.

The USB flash drive in Liu Lang's hand, Shen Mengjie's private cloud, and the trial party.

But all three parties have been connected to the Internet, as long as there is a network, then it is not a problem for a hacker of the level of the melon eating master.

But Liu Lang is still ready to gamble, he has wasted enough brain cells for this matter, and if he loses, he will start all over again, even if he gives Wanliyun Technology to Ouyang Qianqian, he doesn't believe that Ouyang Qianqian can play any tricks in front of him.

Bet on it, Liu Lang directly instructed Zheng Guang not to show mercy, and when Zheng Guang pointed out three moiré patterns on the video file on the spot, Liu Lang hurriedly turned his head to look at Ouyang Qianqian.

He had to know Ouyang Qianqian's reaction as soon as possible, so that he could judge whether he could eat the melon master with confidence, and whether this was another conspiracy of Ouyang Qianqian.