When he arrived downstairs at Gao Yiming's company, Cheng Yu also received a WeChat message from Wu Jing.
After parking the car, Cheng Yu took a look and found that the time Wu Jing received Li Dali's last QQ message was September 16th four years ago.
This almost means that Li Dali left China within a few days after that.
At this point, Cheng Yu called Lao Bian again and asked him about the specific time of Li Dali's ticket to leave China.
September 18th.
This can be completely confirmed that Li Dali left a message to Wu Jing in China. However, Wu Jing told Cheng Yu that he rarely opened QQ, so when he saw Li Dali's message, he had already passed by.
for several days.
Cheng Yu speculated that Li Dali might have wanted to chat with Wu Jing at that time, and might even ask him to meet and have a meal to say goodbye or something.
But because Wu Jing failed to reply in time, Li Dali was left alone.
Judging from the normal behavior pattern, the time when Li Dali left the message to Wu Jing should have been when he had just contacted the other party and the other party promised to build a research and development team for him so that he could use his talents.
The other party should have asked Li Dali for his ID number, passport number, etc., and then went directly to help him apply for a visa and other matters. Then his first visa application was rejected, but the other party had great powers and immediately got one from Chile.
Proof of labor service abroad. With the guarantee of the other company, Li Dali’s visa will not be a problem.
Cheng Yu estimated that maybe Li Dali didn't expect it to be so fast. After all, according to normal procedures, it would take four or five working days just to apply for a visa. At that time, Li Dali might also have felt that he would have at least a week left in the next step.
He had time to prepare, but he didn't expect that just two days later, the other party informed him to go directly to Shanghai, and then took a plane to leave China.
This is probably the reason why Li Dali left a message for Wu Jing but did not call him to invite him out to say goodbye.
A person who thinks he still has at least a week left will definitely not be in a hurry to say goodbye to his friend. He probably just wanted to share the good news with Wu Jing that someone was willing to invest in him and build a research and development team.
But time was in a hurry, and he was already on the plane to Santiago, Chile on the third day, which resulted in him and Wu Jing not being able to have a simple communication on this matter.
Going upstairs, the little girl at the front desk already knew Cheng Yu and led him directly to Gao Yiming's office.
"Master, what do you want me to do for you again?"
"Find a technician, preferably someone who is proficient in IP tracking."
Gao Yiming was stunned and said hurriedly: "Master, why do we need to use hacking methods?"
"It's not as mysterious as you think. There is an engineer in the research institute who has been missing for four years..." Cheng Yu briefly described Li Dali's situation to Gao Yiming.
Gao Yiming touched his chin and said: "This is really strange. The point is, no matter what the other party wants Li Dali to do, why do they want to cut him off from the outside world? Could it be that they want him to leak military secrets that he participated in research and development in the past?
?”
"You ask me, who should I ask? Hurry up and find a technician."
Gao Yiming picked up the phone on the table, gave an order, and called for a person named Xiao Nie to come over.
Not long after, the door was pushed open, and a young man who looked quite honest, or to put it more bluntly, a bit of a middle-aged man walked in.
"Mr. Gao, are you looking for me?" As he spoke, Xiao Nie pushed up the thick black-rimmed glasses on his face.
Cheng Yu looked at him.
A red and gray plaid shirt on the upper body, khaki casual pants of washed fabric on the lower body, and a pair of black leather shoes with a very contemporary style. No matter how you look at it, it is the standard image of a programmer.
"I need your help with something..." As he spoke, Gao Yiming asked Cheng Yu to take the business card and gave Xiao Nie the address on the back of the business card. "Go up and check out the backend address of this website, as well as the login name and password.
Look, how many different IP addresses there are."
Xiao Nie didn't ask any questions, took the business card, sat down on Gao Yiming's seat without hesitation, and then directly entered the address of the website's backend into the computer's browser.
With flying fingers, I quickly verified the password and entered the backend of the website.
After a very simple operation, Xiao Nie retrieved all the IP addresses that had visited this website.
"The IPs are all here, what do you want me to check?"
Cheng Yu said: "First distinguish these IP addresses to see if any are from non-Wudong areas. It is best to directly find IP addresses from foreign areas."
Xiao Nie: "Oh." He continued with his fingers flying and muttered: "This requires writing a simple program to conduct a large-scale selection. There are not many IP addresses, but there are tens of thousands of them, covering all areas.
Almost five years..."
It didn't take long for Xiao Nie to finish writing the small program. After pressing Enter, the program started running.
Soon, those IP addresses went through preliminary selection, and all Wu Dong’s local login IPs were deleted.
"It's done, there are almost two thousand more from non-Wudong areas."
"There are so many more?" Cheng Yu was a little surprised.
Xiao Nie said: "Although the number of visits to this website is very limited, netizens always come from all over the world. The number of entries has been reduced from tens of thousands to more than 2,000, which is already very few. This only shows that this website is private enough.
Basically only locals in Wudong will know. Which store's official website is this? That's not right. Even if it is the official website of a small store, only tens of thousands of people have visited it in five years. This is too inefficient. This
The store should have closed long ago!”
"Only two people know the address of this website."
"Ah?" Xiao Nie was stunned for a moment, then he held up the black-framed glasses on his face again, and murmured: "That's quite a bit of frequent interviewing. There were tens of thousands of interviews in five years, and only a little over a thousand days in total.
There are dozens of visits every day. Hey, no, almost half of these IP addresses were visited four years ago, and the proportion in the past four years is less than 40%. Three
Ten thousand a year, more than a hundred times a day..."
Cheng Yu thought that this was consistent with what Chen Huan said, and he added: "Are you talking about the total number, or the remaining two thousand miles?"
Xiao Nie said: "It's almost the same. More than 60% of the total number was concentrated in the first year. After the selection, more than 60% was also concentrated in the first year..."
Cheng Yu was stunned for a moment, then said: "That means these IP addresses include backend logins."
"That's for sure. The backend and frontend are actually a set of systems. This is a second-level page grafted on a cyberspace provider's website. The backend is a third-level page. No matter whether you visit the frontend or the backend, it will be recorded.
Under the entire secondary URL."
"Can you tell which ones are logged in from the background and which ones are logged in from the front desk?"
"This is simple." Xiao Nie said as he moved his fingers so fast that they almost formed a shadow. Cheng Yu was speechless while watching, thinking that this was indeed the speed of a man who had been single for more than 20 years.
In just a few minutes, Xiao Nie distinguished all the IP addresses again. He said: "There are more than 45,000 IP addresses accessed by the front desk, and only more than 4,000 IP addresses accessed by the backend. Hey, it's interesting. The front desk accessed these IP addresses.
Of the more than 40,000 items, less than 8,000 are from within four years, and more than 80% are from the first year. The more than 4,000 items in the background are more average, but are from the last two years.
, accounting for more than 50%, and only 40% in the first three years."
Cheng Yu thought about it briefly and understood.
Backstage access is Chen Huan’s masterpiece.
She basically accesses the backend at a fixed time and a fixed number of times every day, with the purpose of uploading photos and videos of her children. The number of times may vary from day to day, but in years, it is almost average.
The reason why it was so high in the past two years is that Chen Huan discovered that these photos and videos had not been accessed at all, which meant that Li Dali had never visited the website again, so she increased the number of visits to the backend to see what Li Dali was doing.
When will I come back and take a look.
This was also the reason why Li Dali's relatives came to her to inquire about Li Dali's whereabouts and contact information. Although Chen Huan reported the case at the time and did not follow up on it since then, she could not ignore it completely.
Therefore, the number of visits in the last two years has been higher than in the first three years.
"Among the access IPs at the front desk, are there any that were after September 18th four years ago?"
When Xiao Nie heard Cheng Yu's words, he immediately pulled the slider on the right, pulled it all the way, and took a glance.
"Hey, there are only more than fifty items..." Xiao Nie looked at them one by one and said quickly: "The more than fifty items were visited in two days. On the first day, there were more than forty items, and on the second day, there were only eight items... respectively.
They are September 20th and September 21st. There is no access record on September 19th..."
Cheng Yu nodded, thinking that it seemed that Li Dali still paid a visit after going abroad.
The reason why there is no access record on September 19th is because he was on the plane at that time and during various transfers, so he had no time or opportunity to access this website.
On the 20th and 21st, he should have arrived at Falklands and got a computer and Internet, so he browsed the website.
Xiao Nie was still browsing the more than 50 access records, and muttered: "There are upload records in the background on the 20th, a total of eight files, each file...
Hey, there are only twenty-one access records in total. Let me take a look...
Oh, on the 19th, seven files were uploaded in the background, and the access to these seven files also occurred on the 20th. A total of 23 records. That’s right, all the 44 access records on the 20th
Found it. No. 21...
Strangely, a total of nine files were uploaded on the 21st, but there were only eight access records...
Well, the last file uploaded has not been accessed."
Every time Cheng Yu wanted to interrupt, he was interrupted by Xiao Nie. Xiao Nie seemed to have entered a state of complete selflessness. He was the only one in his world, completely ignoring Cheng Yu's existence.
"This is not in line with this visitor's access habits. Let me see, the nine files on the 21st were uploaded almost at the same time. Why did he only access eight of them, and only once? I checked.
check……"
Xiao Nie looked forward and continued to babble: "The files uploaded further forward have more visits, um, but the visits on the same day are basically about two to three times, and the time is quite fixed, all at 9 pm
Between one o'clock and ten o'clock.
This is even more strange. I have been visiting this website every day for more than a year. Most of the time I am accessing the files uploaded on that day. However, as the number of files uploaded in the past increased, I began to selectively visit this website.
In September, the number of daily visits reached almost two thousand..."
