Founded by Tianxuan, a former national defense university teacher and military history expert, "Heavenly Selection Miscellaneous Talks" welcomes attention and takes you into the wonderful world of military history
Wu'er stepped on the blood to trap Yiling, and the war knife pointed at the west to kill qi. It will be destroyed and then quickly, and the bomb will rain like rain.
The remains of the corpses were propped up, and the stumps were blocked by the road. How many civilians were killed by bullets, and their flesh and bones were instantly turned into soil.
This is a poem describing the tragic scene of the Japanese military planes when they bombed Chongqing, the capital of China, during the War of Resistance Against Japanese Aggression, in fact, before the Japanese army bombed Chongqing, most of the Nationalist governments were able to intercept the telegrams of the Japanese army, but there was no way to decipher them, which made Lieutenant General Yu Dawei, who was then the director of the National Government's Ordnance Industry Bureau, very distressed.
During the War of Resistance Against Japan, there were many ways to convey information, of which the more mainstream way was through the telegraph. At that time, the telegraph mostly decomposed Chinese characters into four numbers. In this way, whatever information is intended to be conveyed, it becomes possible, but this method becomes a clear code, that is, any trained personnel can decipher such a telegram. Therefore, when passing military secrets, it is necessary to go through secondary encryption, which is the so-called secret electricity.
Yu Dawei is a graduate of Harvard University in the United States, very mathematical talent, he knows that cryptography and mathematics are inseparable, the Japanese army used at that time the cryptography technology is the original file, commonly known as "plain text", with mathematical methods to transform it, called "encryption". Encrypted files, commonly known as "ciphertext". The "ciphertext" is transmitted, and even if it is intercepted, others are like flowers in the fog, and it is difficult to understand its meaning. If you can find the law of encryption, you can decipher the secret telegram.
How to figure out the laws of the Japanese army's cryptographic algorithms, he quickly thought of Hua Luogeng, a famous mathematician in China. Because both he and Hua Luogeng have published articles in the world's top mathematical journals. While studying in Germany, Yu wrote a mathematical paper in 1925 and published it in the most prestigious German mathematical journal (Mathematische Annalen), one of the world's top mathematical magazines at the time, and he was the first Chinese to publish an article in the journal. A few years later, Hua Luogeng also published a paper in the journal, becoming the second Chinese.
In 1943, when the Kuomintang government heard that the United States had an atomic bomb and planned to organize a delegation to investigate the United States, Hua Luogeng and others were invited to Lushan for "intensive training" to study and judge the possibility of China making an atomic bomb, and Yu Dawei, then director of the National Government's Ordnance Industry Bureau, was also a participant and organizer of the conference.
After Yu Dawei arrived in Lushan, he took the initiative to visit Professor Hua Luogeng, and after the two of them chatted for a while, Yu Dawei talked about the recently intercepted code telegrams, and handed over the Japanese army code telegrams to Hua Luogeng, hoping that Hua Luogeng could turn the chaotic numbers of the Japanese army code messages into regular numbers that could be deciphered! If Hua Luogeng can find out the rules for the arrangement of the numbers of the Japanese army, the problem of the Japanese army's code and telegram will be solved.
As a mathematician, Hua Luogeng likes to solve mathematical problems, not to mention that this is still a very meaningful thing for the war and the country. For such a big event, Hua Luogeng did not dare to delay for a moment and decided to decipher it overnight. In order to ensure that Hua Luogeng deciphered the code, Yu Dawei asked Major General Cai Mengjian of the "Central Bureau of Investigation and Statistics" at that time to do a good job in the security work and safety of Hua Luogeng, and Cai Mengjian and Hua Luogeng lived in the same room.
After Hua Luogeng accepted this task, he hid in his room and began to decipher, smoking all night to refresh his mind, concentrating on finding the rules. I sat at my desk from the afternoon until the early hours of the next morning. And Major General Cai Mengjian, in order not to disturb Hua Luogeng's work, did not even dare to make a noise when he went to the toilet.
When Cai Mengjian got up the next morning, Hua Luogeng had already begun to wash up. It was also at this time that Hua Luogeng handed him a stack of manuscript paper and asked it to be handed over to Yu Dawei. And said he was too tired now and needed a break. Later, Cai Mengjian recalled: "The next morning, Professor Hua went to the toilet, and when he came out, he took a stack of manuscript paper, full of words, and handed it to me: "The problem has been solved, but I don't have time to copy it again." Please forward the general immediately to Director Yu. ”
In this way, Major General Cai Mengjian quickly gave the manuscript paper to Yu Dawei, and Lieutenant General Yu Dawei was ecstatic after reading the case, and immediately ordered: Quickly decode it according to the method instructed by Professor Hua Luogeng! Soon these figures were translated into the Japanese military's battle plans, and with these plans, the Nationalist government stepped up its prevention work, and the Japanese air raid casualties were greatly reduced!
After liberation, when Hua Luogeng recalled this deed, he still said with great vigor: "The encryption process from the plaintext to the ciphertext, the original "Mubius function" used by the Japanese army! Then, using the inverse function of the "Mubius function", the ciphertext is immediately reduced to plaintext! ”
After saying that, he sighed: "Mathematics is of great use!" He was always a curious child in the face of mathematics!