It turned out that as early as the Songhu Anti-Japanese War, when Zhou Wen raided the headquarters of the Japanese 24th Brigade, due to the sudden speed of the attack, the radio operator at the Japanese headquarters was killed before he could react. Zhou Wen seized the Japanese military code at the brigade level. This book, coupled with the Japanese spy code books previously seized at Huangdu Station, and these Japanese spies were affiliated with the Japanese Army Intelligence Department, so Zhou Wen had two Japanese military code books in his hand.
Of course, these codebooks were handed over to Zhou Yongbin for study.
Zhou Wen did not dare to expect that Zhou Yongbin would be able to decipher the Japanese army's code with these two different code books.
However, you must know that the Japanese army's codes have levels. The radio codes of the brigade, regiment, brigade and division are different. As long as Zhou Yongbin can study the rules of these two code books, at least he can learn from the same and different codes in the future. From similar signals, it is possible to determine which set of codes the Japanese army used, thereby knowing the level of the sending unit.
What Zhou Wen doesn't know is that Zhou Yongbin's ultimate goal is not just this. You must know that he studied radio technology in Japan, adhering to the Japanese's habitual thinking and application direction of cryptologic. And the key is, he is still in Geniuses with sharp intuition and computing power in this area.
As early as when he was studying in Japan, he accidentally deciphered the telegrams of the Japanese army department, which attracted the attention and vigilance of his teacher. As a result, he did not dare to show his talent in this area for a long time after returning to China.
Now that he had two code books, Zhou Yongbin immediately organized the communications platoon and the urban management core, as well as several of his proud disciples, to start in-depth research together. But he knew that this kind of thing needed to be kept strictly confidential. Except for a few officers and soldiers of the communication platoon, even a few disciples of the urban management department did not know that they were studying the Japanese army's code book.
And before there were any results, he did not report to Zhou Wen because he was afraid that his research would be fruitless and everyone would be happy in vain.
After nearly a year of research, we finally found some interconnected clues.
This time, Zhou Yongbin wanted to obtain another Japanese brigade-level code signal to compare it with his own research results to see if he could get the desired results.
This is the reason why Zhou Yongbin did not go to the village to rest, but stayed in front of the radio station.
After listening to Zhang Xinhe's report, Zhou Wen was overjoyed and quickly asked: "Does this mean that the Japanese military radio station can be deciphered?"
Zhou Yongbin used his fingers to hold up his glasses and said solemnly: "You can't say that now. You must know that since the advent of radio and Morse code, military communications have entered a new era."
"But radio communication is a completely open system. When one side receives the message, the other side can also see it clearly. Therefore, the codes that accompanied wars in human history were immediately combined with radio, and radio codes appeared. Until the above After the Second World War, all radio codes were manually coded, that is, coded by humans."
"For example, I wrote the radio communication code within our mercenary group now, and we can't just use one set. Generally speaking, a country's army may need dozens of sets of military codes to deal with different arms and different military units. Different from other times, our mercenary group is relatively simple, so I only compiled four sets, divided into four levels: A, B, C, and D."
"D-level is the code we first used when we first arrived in Shanxi. Now it is only used for external contact. For example, scholar, some of your senior officers have our D-level code books."
"Level C is also used to communicate with the outside world, that is, currently with Shanghai, as well as with the contact passwords of Fuyuan Company and various factories."
"Level B is our military code. It is only used for internal communication within our troops. Even the simulation brigade does not have it. Only the telecommunications team we sent is responsible for receiving and translating it."
"Level A represents the highest level. It is not used under normal circumstances. Once used, it represents the most urgent situation or a backup measure if the B-level code is deciphered by the enemy."
"When I was studying in Japan, I heard that Germany had invented a machine that could automatically code, called the 'Enigma' cipher machine, and it was immediately used in the German navy and army."
"The cipher machine is easy to carry, easy to use, and more importantly, it has extremely high security. For the enemy, even if the cipher machine is captured, it will still be unable to decipher it if it cannot master the keys composed of the three lines of defense at the same time. But 'Well If the operation of the Nigma's cipher machine and the data on the internal circuitry of the rotor are leaked or thoroughly studied by scientists, we will also face the risk of the code being cracked."
"When I was studying in Japan, Japanese cryptography experts also had a big debate on whether to continue to write manually or use cryptography machines. My teacher, Professor Oda Shihei, was also a member of the expert group, but for some unknown reason, the final discussion The result is that manual writing is more convenient and reliable."
When Zhou Wen heard this, he felt that one of the reasons why the Japanese did not use cipher machines was to save costs. Although Japan claims to be a powerful country in Asia, it is also the king of monkeys without tigers in the mountains. It is a small island country with so few resources that even to produce a screw, it relies on imported raw materials. Naturally, it will save what it can, and it will never use machines if it can be done by people. .
"So the current Japanese army still uses manually written codes?" After Zhou Wen finished speaking, he immediately realized that his question was redundant. Why bring a code book if it is not written manually?
Zhou Yongbin's face was glowing at this time, and he didn't pay attention to Zhou Wen's yellow accent. He said in a confident tone: "As long as it is written by people, it must bring with it some thinking habits and inherent coding logic of coders. And I am When I was in Japan, I learned some basic logic of Japanese radio codes, and it is not difficult to find the common points of their different codes."
"Especially after getting these two code books, I made a detailed comparison and analysis based on the ideas and logic of deciphering the Japanese Army's code accidentally. Coupled with the excellent computing skills of several students, I finally found some There are clues, and I dare not say that the Japanese army’s code has been completely deciphered now, but it is still possible to partially decipher it.”
Having said this, Zhou Yongbin looked at Zhang Xinhe with approval and said, "Xinhe and several college students from the Urban Management Department were very helpful in this matter, especially the little girl named Zhang Yan, who is really a genius in mathematics. She led people to complete a lot of tedious calculations, but it's a pity that she is a thin girl, otherwise I would have wanted you to transfer her to the communications platoon."
When Zhou Yongbin mentioned Zhang Yan, Zhou Wen, who has a super memory, immediately thought of this little girl with wide-rimmed eyes and a short stature.
