Yang Xunzhen lived in the backyard of the Jinjiang Chuanwei Restaurant, and he didn't dare to show his face too much, so he could only listen to the radio signals of all parties in the underground telecommunications room of Feng Chen's intelligence group every day. Pen? Interesting? Pavilion wWw. ｂiquge。 ｉｎfo

According to the list that Feng Chen had given him Yang Xunzhen, Wan Molin quickly got several radio stations, among them, there was also a state-of-the-art receiver.

With these equipment, Yang Xunzhen decided to start fighting immediately, and she was going to fight the Japanese in this Sichuan-style restaurant in the French Concession of Shanghai, and fight with the Japanese on an invisible front.

On the first day, Yang Xunzhen just went online to listen to the signal casually, and browsed the radio network at will.

Although he has been away from the motherland for less than a year, Yang Xunzhen is like a foreigner who has just arrived in a strange place for the telecommunication signal here in Shanghai.

From the general classification of telegraph equipment and telegraph types, Yang Xunzhen found that Shanghai's underground radio stations can be divided into two categories:

The equipment of the first type is relatively poor, and the sound emitted is dry and hoarse, but the transmitter is very powerful, and it is obvious that it transmits information to distant places, and this type of telegram is all Arabic numeral secret reports.

The other type of equipment is better, the sound is clear, the technique is superb, obviously it has undergone strict training, but the power of the transmitter is smaller, suitable for communication in a small space range, this kind of telegram is all English alphabet secret report.

When Yang Xunzhen was training at the CIA, she came into contact with a large number of secret reports from the Chinese and Japanese armies, and she was very familiar with the secret reporting habits of both sides.

The Chinese military is accustomed to using digital ciphers, while the Japanese military prefers to use English codes.

Therefore, Yang Xunzhen judged that the first type of telegraph should belong to China's underground organization, simply using the elimination method, and the second type belonged to the Japanese, and there are two such high-power signal sources.

After the separation, Yang Xunzhen decided to use all his energy to deal with the secret radio station of the Japanese.

Yang Xunzhen chose the radio of the Japanese Military Police Headquarters in Shanghai to listen, because with Feng Chen's assistance, Yang Xunzhen quickly distinguished the radio signal of the Japanese Consulate in Shanghai from the signal of the Military Police Headquarters.

For codebreakers, the daily changes in radio stations make it much more difficult to detect, because you don't know what frequencies it will change to, or what new call signs it will use.

However, these are difficult for Yang Xunzhen, after long-term training, she has developed a strong skill, and she has never forgotten the characteristics of the radio operator's reporting techniques, which is also Yang Xunzhen's unique talent.

She could hear which operator was sending the report from the Military Command Headquarters and the Central Command Headquarters, no matter where they hid, as long as they spoke out, they would be caught by Yang Xunzhen.

She even calculated the duty schedules of the four newspaper operators of the military command and the Central Command Headquarters, and sometimes, at a certain moment, a certain newspaper operator did not appear according to the time on Yang Xunzhen's duty schedule, Yang Xunzhen would silently say: "Another temporary shift!" ”

In addition to these, Yang Xunzhen also detected the high-power radio signal sent to Yan'an, and there are two sources of this signal, Yang Xunzhen analyzed, one may be the office of the Eighth Route Army, and the other signal source should be secret.

Yang Xunzhen was naturally interested in radio, sometimes, he stayed in the basement all day and didn't come out, many times, Feng Chen asked Fang Xiaoman to replace Yang Xunzhen, but she took a little rest and continued to get on the plane.

Yang Xunzhen archived the transcribed telegrams one by one, continued to concentrate on dealing with the Japanese radio station, patiently collected materials, looked for the flaws of the opponent, and slowly walked towards the ultimate goal of nothingness step by step.

Professor Wilson, Yang Xunzhen's American codebreaker teacher, once said: "The Japanese are a people who are born with a lack of mathematical talent, and they will never be able to compile first-class codes." ”

In the same vein, Professor Wilson said: "There is a basic rule that must be followed in espionage work, that the interpreter and the telegraph operator must be two persons, and that the same person must never be allowed to hold two jobs, or even to translate and send newspapers in the same place." ”

In the past few days, no matter day or night, eating and sleeping, Yang Xunzhen's brain has not stopped pondering his opponent for a moment.

According to the first definition taught by Professor Wilson, the code of Little Japan can be boldly flouted strategically and fully established with confidence in cracking it.

According to Professor Wilson's second definition, through what he learned from Feng Chen, Yang Xunzhen analyzed that the radio stations on the Japanese army fought with the troops, and it was impossible to bring another translator with them.

The arrogance of the Japanese soldiers, coupled with the dangerous nature of espionage work, determined that it was impossible for these Japanese soldiers to carry a code book with them, that is to say, this radio station of the Japanese Military Police Headquarters did not need a secret book, and the receiver could compile and decipher the secret report with the help of his brain memory.

There is no doubt that the Japanese military police command used a secret table encryption system.

With this initial gain, the next step is to copy the secret table of the Japanese military, which is a very painstaking and meticulous work.

But completing this step is only the beginning of deciphering this set of codes, and the more difficult thing is still to come, which is to find their key.

If the whole set of passwords is compared to a safe, to compile the secret table, it is only a copy of the exact same safe, and the design, structure, performance and other characteristics of the safe are well understood.

And the key is the key that finally opens the safe, without which even the designer and maker of the safe are powerless.

After locking on the target of the attack, Yang Xunzhen's schedule became simpler.

Fortunately, according to the key to the "Sakura Club" of the Japanese Ministry of Foreign Affairs provided to her by Feng Chen, that is, the "Tale of Genji", she quickly deciphered the correspondence between the Japanese Consulate in Shanghai and the Japanese Ministry of Foreign Affairs.

However, the Japanese Army General Staff Headquarters has its own set of passwords, and the key may not even be clear to Hiraoka Ryuichi, without which Yang Xunzhen will not be able to crack the Japanese military's code.

In order to obtain the key of the Japanese military, Yang Xunzhen transferred the receiver to the radio station of the Japanese consulate in Shanghai at a fixed time every day and transcribed their telegrams.

The rest of the time, she locked the radio on the high-power radio station of the Japanese military police headquarters, and listened around the clock, collecting more and more materials, but there was no progress in deciphering it.

Yang Xunzhen's work has become more boring, tedious and tedious.

The Battle of Wuhan is at a critical time, and if she deciphers the Japanese army's communication code one day earlier, she will contribute to the Battle of Wuhan one day earlier, and she will find the key to crack the Japanese code.

Yang Xunzhen felt as if he was standing on an endless stretch of sand, and the key he needed to find was the only grain of sand on the beach.

If you search aimlessly, it is almost impossible to succeed with the power of one person alone.

Yes, on your own, it is impossible to succeed, shortcuts must be taken!

But where's the shortcut? Yang Xunzhen felt that not only did he not take a shortcut, but instead got into the dead end set by his opponent, and there was chaos in front of him, with no direction, no light, and no hope.

At Feng Chen's suggestion, Yang Xunzhen could only temporarily put down the work in her hand and adjust her tired brain, and she walked out of the basement.

When he came to the door of his apartment, Yang Xunzhen found that the restaurant owner Dong Lanjun was holding a stack of newspapers in his hand and was about to go to the restaurant in front of him.

"Miss Su, I haven't seen you for two days, what do you want to eat today? I'll ask the kitchen master in front of me to make it for you. ”

Seeing Yang Xunzhen, Dong Lan Jun warmly greeted this mysterious guest who had been closed all day, Feng Chen gave Yang Xunzhen a pseudonym Su Jing, so including Dong Lan Jun, people who didn't know the inside story called Yang Xunzhen Miss Su.

"Boss Dong, take so many newspapers, do you have any news?" Yang Xunzhen glanced at the stack of newspapers that Dong Lanjun was holding in his hand.

"Alas! Don't mention it, it's all bad news, the Japanese are increasing their troops to Wuhan again, and the battle of Wuhan is inextricably fought, I'm afraid that this time our national army is still more than lucky! ”

Dong Lanjun sighed and handed the newspaper in his hand to Yang Xunzhen.

"Miss Su, you look at it first, I'll go to the front, let the kitchen master cook something for you to eat, your body is important, don't get the newspaper dirty, return it to me after reading, I want to collect it all."