In the II period of Country J, as we all know, in 1941, Country A's Pearl Harbor was attacked by Country J, and the Pacific Fleet suffered heavy losses. The director behind this was the famous naval admiral of Country J - SB56, so Country A hated it deeply.
.
In early 1943, two J country submarines ran aground on rocks in the Western Pacific and sank one after another. Of course, country A would not give up this excellent opportunity and sent submarines to check. As expected, major discoveries were made on them and a large number of top secret documents were obtained, including
A newly activated code book by the navy of country J. This code book was then sent to the intelligence department of country A for intelligence deciphering.
On April 14, 1943, the intelligence department of the A Army deciphered a very important message. The detailed itinerary of SB56 is on it. It even includes what the plane looks like and how many there are. The A Army will never give up on this to kill SB56.
With the perfect opportunity, on the 18th, Army A dispatched 16 P-38 "Lightning" fighter jets, knocking out SB56's aircraft and killing SB56 in one fell swoop. This also shows the importance of the codebook.
Li Lvyan realized the dilemma of Wo Gua and said, "Although the decoding book is gone, we can find a way to reproduce it."
In II, the intelligence communications of various countries using radio stations are mainly divided into two parts. One is the transmission part composed of various types of radio stations, and the other is the encryption part composed of cipher machines and code books. In the transmission part, all countries are similar.
, mainly divided into three types of radio stations: short wave, medium wave and long wave.
Radio stations rely on radio waves to propagate signals. Radio waves are not lasers and do not have such good directionality. They rely on diffuse reflection and diffraction and can propagate in the air and the ground. For example, short-wave radio stations have a frequency of 3 to 30 MHz and a wavelength of
It is 10 to 100 meters. This wavelength belongs to the meter band and has obvious diffraction effect. It even forms ground waves that propagate along the sea water. The radio station can propagate for tens of kilometers without relays. So this is actually a broadcast signal that can be received by friendly forces.
, of course the enemy can also receive it.
The radio stations at that time were all analog radio stations, unlike today, which are all digital communications. Digital communications must understand the enemy's data frame format before it can be deciphered. In other words, you need to use the same baseband module as the enemy to parse their information.
As long as you tune the analog signal to the same band as the enemy's radio station, you can listen to their calls. Because of this, battlefield regulations require soldiers to use pre-agreed code words when using the radio. If you use plain language, it can easily cause intelligence
Give way.
As for telegraph messages, each company has its own key. Therefore, if the enemy does not have the key, intercepting it is of little significance.
In order to be able to decipher the other party's encrypted messages, during the II period, the Allies and the Axis powers each assembled a large number of mathematicians, accumulated samples by collecting a large number of enemy radio messages, and then asked the mathematicians to reversely decipher them. From this, the cipher was developed.
The spear and shield of learning.
The world's first digital electronic computer put into use was invented by Alan Turing, a genius mathematician from Country E, and was used to decipher the Enigma cipher machine of Country D. Before this computer was put into use, it was impossible to decipher the Enigma cipher machine.
A cipher machine is almost impossible.
Because of the Enigma machine, the plain text of the telegram is converted into encrypted message through this machine.
But if the telegram is intercepted by a means, you need to have a "code book" to decipher the content. The content inside is the Chinese characters corresponding to the numbers. For example, if you intercept the "245, 235, 653, 532, 135" sent by the J Army Radio, these corresponding Japanese characters on the code book
can form a sentence - using Morse code.
Another example is the code book that was crushed by Wo Gua. As long as Wo Gua didn't crush the code book, now it's almost at your fingertips what kind of information this radio station has collected.
The radio stations in the II period used radio broadcasting technology, which is equivalent to today's radio signals. Anyone can receive them, but it only depends on whether the received signals can be decrypted. Because at that time, there were radio communications and there were many radio frequencies. The military's radio frequencies were often changed.
, causing the other party to be unable to accurately know which one is the enemy's. In addition, there is telegram encryption technology. Although it is intercepted, it cannot be understood without the code book. The principle is the same as using FM radio to receive broadcast signals. The difference is that the
Enemy radio signals need to be cracked; but receiving broadcast signals does not require cracking.
II Intercepting enemy radio stations is a technical job, and it is also a boring job. First of all, searching for enemy signals is a very boring but very serious job. There are many radio frequencies, and the frequency difference between the two radio stations is only 0.1MZH, not to mention the military
Radios and spy radios are not always turned on. Intelligence personnel must wait patiently for the enemy radio to turn on, and then determine the frequency of the enemy radio as quickly as possible, and quickly and accurately record the information sent by the enemy.
After receiving information from an enemy radio station, the most difficult step is to crack it. Cracking the password is very difficult for ordinary people like us. The password usually has a code book, which is only in the hands of the enemy. The code book may be a book, or some
The codebook is specially written. Experts who crack the code have their own cracking theory, which is unknown to outsiders.
After cracking the enemy radio signal, we can reversely write the enemy's code book. In the future, when the enemy sends information, we can learn the content of the enemy's communication based on the code book. This is to intercept the enemy's telegram.
When a military radio station intercepts a telegram sent by an enemy radio station, it has nothing to do with what radio station is used. There were no FM radio stations at that time. What you need to know to intercept an enemy radio station is the frequency and call sign of the enemy radio station. Experienced operators can use common frequencies used by the enemy.
Search within the range, and determine which station it is based on the transmission method, etc. Once the judgment is accurate,
Monitor and intercept the other party's telegrams. At that time, anyone on the radio could hear the message, and the message code could also be copied down, without the sender even knowing.
Of course, the telegrams sent by the military radio stations are encrypted. Deciphering the telegrams is a big science. Both countries D and J have suffered from the interception and deciphering of telegrams. SB56 was ambushed because the telegrams were deciphered.
Li Lvyan turned on the power switch and found that it was indeed out of power. He unscrewed the two batteries from the flashlight, then pulled out the coil connected to the power supply in the radio. After confirming the positive and negative poles, he connected them directly to the battery and turned on the switch again.
, and sure enough, it works this time.
Jing Qiongshuang and Wo Gua couldn't help at this time. Looking at Li Lvyan's operation like a goddess scattering flowers, Wo Gua couldn't help but ask, "Brother? Is it true that radio knowledge is also from college?"
One of the required courses?”
Li Lvyan said without raising his head, "This is my elective course."
"Damn, that's awesome, what kind of university is this?"
Li Lvyan smiled and said nothing, just like he realized a truth during the English listening test: some words should only be spoken to those who understand.
Following a methodical operation, the radio station suddenly made a "beep" sound of electricity. The two of them listened carefully and felt that the sound of the current sounded noisy at first, but each transmission seemed to have a certain pattern, and they couldn't help but stare.
Eyes: Okay?
Li Lvyan, Wo Gua, and Jing Qiongshuang carefully moved all the accessories of the radio station to the operating table. Wo Gua held two dry batteries without daring to breathe: For this kind of thing that is now an antique, even the right
Every time it blows, it is blasphemy, and every time it blows, the effect is not good. Last time, it blew on some sleeping beauty, and ended up driving us like that in the operating room.
A broken heart is like a broken glass, the stupidity of love can never be recovered.
Li Lvyan tried several frequency modulations, and finally determined the channel at one point: Regardless of anything else, the marks in this groove were deeper than the others, and most importantly, there was a layer of light yellow grease on it: this
It is the traces left on the surface by the long-term contact of the skin with plastic products, which is combined with the dust in the air for a longer period of time.
"Bahba-didi-didi-bah-bah-"
The sound is so noisy that it is difficult to distinguish. Maybe only one number can be heard within one minute of the broadcast. Fortunately, what the three of them need most now is to figure out what happened here, and this unexpected acquisition
The radio station became a top priority, so no one complained.
Li Lvyi broke off a piece of dried white powder from the wall, which he could use to make chalk on the ground. According to the wavelength obtained by the radio, as long as it could be heard clearly, he marked it.
"23-2,2830,274-,2947,273-,12--,09-0..."
"2730,-284,-273,---1,2837,283-,---9,1---..."
The data is very scattered, and the "-" in the middle represents points that have disappeared or been covered up. Of course, we can't make assumptions out of thin air if we can't be sure, so I used this symbol instead.
Li Lvyan wrote from the side of the hospital bed to the end. It was not that the information he got was overwhelming, but that each piece of information played definitely only said one thing. The problem was that this one thing was intermittent every time he listened to it.
, either you heard the beginning clearly but not the end, or you could only get a few short wavelengths, but other meanings were obscured by noise. The information you got was complicated and overlapping, so you could only listen a few more times, and then
Find commonalities in personalities.
This is not a false proposition. Ignore individuality and exaggerate commonalities. This requires finding a subset in a large number of sequences and combining them. If there are any remaining data that are ignored, then search for the subset of each segment.
Within the set, find the wavelength that is most reliable and seems to have the most complete data preservation.
When the indicator light of the radio station flashed red three times, the radio station suddenly fell into a huge noise, as if the line was blocked by a jammer from the other side. The loud "beep" sound lasted for a short time.
The sound exceeded the Hertz that the human ear could bear. Wogua was the closest to the sound source and almost turned into a fool on the spot.
Li Lvyan covered his ears and tried his best to go to the radio station and turn off the switch. His cheeks were pale and he was sweating profusely. After Jing Qiongshuang calmed down, he saw Li Lvyan lying on the radio station gasping for air. She thought his condition was serious and was concerned.
asked "What's wrong?"
Beads of sweat continued to appear on Li Lvyan's forehead, and fine beads of sweat appeared on his nose. He panted violently, raised his head and glanced at Jing Qiong Shuang apologetically, "We have been discovered."
In a large pit where gravel fell——
The monsters with dark shadows live together, and they mate wildly. The twisting bodies exude a strange smell, which makes people's nasal membranes tremble and make them sick. There is a lot of mucus flowing out of the ground, and there is a "tick-tick" dripping sound.
Together, they form murky depressions.
There are a large number of biological skeletons placed high and low not far away, and the freshest among them are four. However, these four skeletons have been chewed very clean, and the bones were randomly thrown away not far away, like
Throw it away like garbage.
Next to the four skeletons, there were some scattered fragments of camouflage uniforms that had been torn into countless pieces. I wonder if it was because these fibers could not be laughed at. Some of the fragments seemed to have been swallowed into the stomach and regurgitated, so they were covered with gastric juice and
Unidentified liquid. The same color as the rocks, and several guns with polished bullets, scattered aside, cold and useless, indicating not their existence, but a person who once controlled their team, but now no longer.
exist in this world
evidence of time.
The dark place under the ground——
The darkness and coldness here seem to come from all directions, but the kind of chill that can drive people crazy and surround people's heads for a long time is the culprit of all this primitive darkness.
Following the feeling and extending forward, there was a slight haze in front of me, as if there was a halo of light. Following the line of sight, I saw in the boundless deep darkness, in a medium-sized transparent operation room.
There are many sophisticated instruments placed in an orderly manner, but these instruments are not advanced and can even be called very ancient. They seem to be left over from the II era.
Every instrument is spotless, and you can see the traces of someone wiping it, and it is well maintained.
The most eye-catching one is the main radio station. The indicator light of this radio station is still flashing. It seems that some message has just been sent. Therefore, after a brief prompt of "Message sent successfully", it subsides again.
Next to the radio station, there is a box the size of a radio. The box does not look very big from the outside. It even looks a bit like a record-and-player radio made during the Cold War, but the tape in this radio seems to be running.
, there is a rewinding sound.
"呲呲呲呲——"
However, what is pressed on the function key button on the top of the radio is not a so-called function key, but a red button with four words "interference cell" written in German on it.
The box was still functioning, but suddenly a hand stretched out from the side and lightly turned off the main switch of the box, making a clear "click" sound, which seemed particularly silent in this vast and uninhabited space.
The hand was as bony as a stick, covered with veins, and the nails were very dark. It was only roughly judged that it should be the joint of an old man.
The camera zooms out and the line of sight suddenly extends. If there is a bright light, you will be surprised to find that not far from the transparent operation room, there are rows of neat black walls. These are not the walls of the Weeping God of Jerusalem.
, it is not the empty talk that Mexico is insisting on blocking the two borders, but it is real, a whole black wall in operation!!
Each wall is marked with a serial number, but it is not a numerical serial number, but Japanese characters - "out of stock", "not activated", "on standby".
All the black walls are labeled with these three different labels, and the only difference is that the label "Sold Out" seems to be posted extra often, and there are several walls with "Waiting for Power", but "Not yet"
Enable" this label, leaving only the final black wall.
Taking a closer look at every part of the walls, it turned out that they were not made of building materials, but of Li Lvyan's bold and incredible conjecture.
Twelve hours ago——
"Seven years?" Wo Gua jumped higher. "Brother, this guy has probably had two tires on Huangquan Road. So many batteries can only sustain this space for seven years? Then why is this light still on?
With that?" Wogua pointed at the remaining half of the skull's head, in disbelief.
Li Lvyan narrowed his eyes, "So, either we can find ten operating rooms as big as this room, which are also filled with 258 batteries, or -" he calmed down, "we are in a continuous
In a strange space that cannot be explained." Looking at the operator whose face was transparent and lying on the machine, "Like him, we can't get out."
If there really are ten more operating rooms exactly like this one, then it is understandable why the power supply has been supplied for decades. If there were not——
Jing Qiongshuang thought carefully for a while and asked a very constructive question, "What if there really is a battery, but it is hidden and placed in a place where it cannot be seen from the outside?"
This question was indeed a novel and unique question. Li Lvyan pondered for a while, "If these people have a reason to hide the battery -"
This is destined to be unexplainable for the time being.
The conjecture raised by Li Lvyan at that time was in urgent need of solution but had not yet been solved. The question asked by Jing Qiongshuang just stuck in the throat of the most deadly thing that happened in this underground fortress, but among other things
I didn't realize it, but it was precisely because of the inability to solve that problem that the next three people made a mistake, which almost cost them their lives.
That's right, what is installed in these black walls is not military equipment or other extraordinary things. It is exactly what Li Lvyan boldly guessed before. In the remaining ten rooms needed, the remaining 258
Save a large battery.
I've made big mistakes before the world,
I have committed crimes in front of people,
You should be their idol,
But should not become their relatives,
You will meet many admirers,
Compared with the crowd, you are as graceful as a giant,
You won't find it among slaves,
It is a close heart to you.
As long as there is a lower class, I am with them; as long as there is criminality, I am with them; as long as there are souls wandering in the prison, I am not free.
There is only sin and suffering in this world, and even the cherries are bitter and sour.
Here, apart from the speechless walking corpses all over the ground, he was the only one for decades.
It seemed that he hadn't spoken for a long time, and a hoarse voice rang out in the darkness, spreading viciously to every corner. It was just a simple sentence in Japanese.