Reborn Ace Hack

"Sister Sa must be unable to come due to something."

Xiao Yuanru thought. After the software was built, he started further work, converting the analog radio waves received by the machine into digital signals and importing them into the computer.

With the software, this work was just a purely manual process without any technical content. Xiao Yuan quickly received the binary stream converted by the digital-to-analog conversion module on the machine into the computer.

Since the waveform has a certain periodicity, according to this characteristic, Xiao Yuan only needs to receive one cycle of the signal source. This process is very fast, and it only takes a few minutes to complete. The next thing to do is what really needs to be done.

When testing him, he has to analyze the received binary stream and try to find useful information from it.

There are many difficulties in the analysis process. First of all, Xiao Yuan does not know whether the signal source sends an analog signal directly, or an analog signal converted from a digital signal through digital-to-analog conversion. If the other party sends an analog signal directly, then his current analysis is like

It becomes meaningless to use the structure of animals to analyze plants, and the probability of this happening is very high.

Assuming that the other party sends an analog signal converted from a digital signal, there are also many problems. First of all, he does not know the specific parameters of the signal source to convert the digital signal into an analog signal. Then he wants to restore the other party's analog signal to a digital signal.

, it is necessary to adjust the sampling parameters according to the fluctuation period of the analog signal sent by the signal source. Therefore, the sampling data cannot only be collected in one copy, but many copies should be collected, and then the digital signals converted from these different sampling parameters are sequentially

Perform analysis.

Suppose that among the multiple data streams obtained by Xiao Yuan that correspond to different sampling parameters, some of them happen to correspond to the other party's parameters. He successfully restores the analog signal. There is another problem in front of him, that is, he has to analyze the other party's data.

Don’t know anything about coding…

Therefore, the probability of analyzing the content of the information sent by the signal source through this method is very small, but deciphering it is an extremely difficult task. Xiao Yuan is very clear about this, but this does not constitute a reason for him to give up.

Instead, it made him mentally prepared to face difficulties.

After sorting the binary streams under several different sampling parameters according to his own experience, Xiao Yuan began to analyze them all at once. The analysis process was carried out manually and with software assistance. First, Xiao Yuan converted it into hexadecimal

system code, and then observe its original code and hexadecimal code, such as

If the signal source adopts some common coding methods, based on experience, Xiao Yuan can roughly see some characteristics, and he can be more targeted in the subsequent analysis process, but in the end he was disappointed and directly interacted with some kind of coding method.

The coding method he was familiar with did not happen for a small probability event like the number one.

Visual inspection failed to achieve the goal, so he had to use tools to further analyze these codes. The results still disappointed him. From the analysis results, these codes were meaningless out-of-order codes and had no meaning.

After analyzing all the sampled data streams, Xiao Yuan stood up, stretched, and moved his legs that were numb from sitting. His stomach made a gurgling sound, and he looked at his watch.

Before I knew it, it was already past 12 noon.

"Did Sister Sa encounter something difficult to solve? Why haven't she shown up all morning?" Tang Sa didn't come all morning. Xiao Yuan couldn't help but murmur in his heart. He wanted to make a phone call and ask, here.

But there was no phone. His own phone was left in Tang Sa's bedroom and he didn't take it with him.

When he came to the computer room door and took a look, Xiao Yuan found that the computer room door was locked from the outside. If Tang Sa didn't open the door for him from the outside, he wouldn't be able to get out at all.

"This is really troublesome. Why did Sister Sa lock the door for me from the outside?" Xiao Yuan muttered and walked back. After sitting down, he felt a little uneasy. On the one hand, he was worried about Tang Sa, and on the other hand, he was worried that he would always be there.

If she doesn't contact Xia Jiuying, she will worry about herself.

"Find a way to contact Yingying first, don't let her worry too much." Xiao Yuan made a decision. The phone couldn't be reached. Fortunately, the Internet here is open. As long as there is an Internet connection, it is equivalent to opening a door to the outside world.

window.

Xia Jiuying rarely takes the initiative to touch the computer unless necessary. Therefore, if Xiao Yuan wants to contact Xia Jiuying through the Internet, he can only use roundabout tactics and send messages to her through others. The first person he thinks of as the messenger is Jessica.

, because if Jessica was in school, she would spend time in the innovation laboratory almost every day, and as long as her computer is turned on, it is always online.

There is a public irc channel on the innovation laboratory's server. The purpose of setting up this channel is to allow laboratory members who are on business trips to communicate and contact other members of the laboratory. Xiao Yuan logged in anonymously through this account.

chat room, but what frustrated him was that Jessica was not online. In fact, not only her, but also the people he knew well in the chat room, Han Xiaoyu and Mark, were not online either.

Xiao Yuan looked at the time and thought that Jessica might have gone to eat at this time, so he left a message for her, and then left the chat room to switch to the background. If Jessica came online later and saw his message, he would send it to him

When replying, there will be an automatic prompt here.

Tang Sa didn't come, so Xiao Yuan decided to continue analyzing the data stream he had obtained. Previously, he used a variety of tools to automatically analyze but failed to get results, which made him decide to temporarily abandon the tools and conduct manual analysis again.

Staring at the computer and looking at binary strings is a very uncomfortable thing. Xiao Yuan decided to do a stupid job and copy these binary strings from the computer. He found a piece of white paper and Xiao Yuan copied these strings at once.

A new round of analysis started again, and more than an hour passed after this bow, and the result still disappointed Xiao Yuan.

"Sister Sa didn't come, and Jessica didn't reply to my message." Xiao Yuan raised his head and moved the chat room to the front desk. He saw that Jessica was still not online, and Tang Sa didn't come either. This made him sad.

He couldn't help but worry.

After scanning the chat room, Xiao Yuan found that Han Xiaoyu was online, so he sent him a greeting. After a while, Han Xiaoyu responded. Xiao Yuan asked him to bring a message to Xia Jiuying for him, saying that he had something to do in San Francisco and could not return for the time being.

Went, and Han Xiaoyu readily agreed, which made Xiao Yuan feel relieved.

Xiao Yuan waited for a while, and even ran to the door and patted it a few times, but it was obviously of no use. There were two doors in this computer room. The inner door was locked from the outside, and the outer door made no sense.

If it is not locked, and the two doors are very thick and have very good sound insulation effect, let alone banging on the door from inside, even if he is banging on the big drum, the possibility of the sound spreading outside is almost zero.

After knocking on the door to no avail, Xiao Yuan returned to the computer and sat down again. Under this situation, he was very worried about Tang Sa, but he also knew that worrying at this time could not solve any problems at all. It was better to do the things in front of him with peace of mind.

.

With this idea in mind, Xiao Yuan once again shifted his gaze to the densely drawn paper in front of him, pondered for a moment, and thought about whether he should change his thinking, diverge and maybe make new discoveries.

With this idea, Xiao Yuan abandoned the original conventional analysis method and tried new methods again and again. If one method didn't work, he would try another one. Time also passed minute by second in this constant trial.

In the past, the day was almost passing without realizing it, and Xiao Yuan finally tasted the fruits of victory after experiencing countless failures.

However, when he got the victory fruit, he was so shocked by the fruit that he suddenly jumped up from his seat and became extremely manic due to extreme worry.