Late at night, the Shuntian Prefecture Yamen in the north of the inner city of Beijing was brightly lit.
Late at night, the lights were brightly lit at the Ministry of War Yamen in the Qianbu Corridor on the south side of the inner city of Beijing.
However, in the Ministry of War in the south, when the Minister of War Lu Wan learned who were working late into the night in the Shuntian Prefecture in the north, he lost his temper for the first time in his life and dropped the pen in his hand.
After that, a trusted clerk who had followed him for more than ten years and had seen Lu Wan promoted from doctor to minister was kicked out for giving him some irrelevant advice. Others were even more afraid to speak.
"Wang Datou can invite anyone to his Shuntianfu Yamen to help, but my Ministry of War Yamen is clean and tidy, and no outsiders are allowed to enter!" Although he said these righteous words, Minister Lu was very angry in his heart.
Before, Zhang Shou pointed out the key point in Zhigong Building, and he had thought about bringing his son Lu Sanlang here to decrypt the secret. However, even as a minister, he couldn't just bring his son into such an important place as the Ministry of War! As a result, because of his hesitation and not telling his family to put Lu Sanlang under house arrest, Wang Datou got there first!
That unfilial son actually went to help Wang Datou!
He took a deep breath and said in a cold but stern tone: "Dr. Zhang has already pointed out the key points of the secret letters. All the clerks in the Ministry of War who are best at numbers and calculations have gathered here. If you can solve it before dawn, then everyone can atone for their crimes. If you can't figure it out, I will of course apologize to the emperor. You all have made mistakes too! This time the Ministry of War has lost face!"
The Ministry of War needed to decipher thirteen secret letters at once, but the Shuntian government office had a prefect named Wang Datou who had a very high level of mathematics. Therefore, Zhang Shou and three other students only had to decipher one secret letter.
However, Qi Liang and Lu Sanlang, who had arrived earlier, read this letter over and over again, pondered it over and over again, but were still confused.
After Zhang Shou took over, he first checked the twelve letters that were previously claimed to be solved, and only then did he look at the last letter that had not been solved, and then he began to fall into deep thought.
Perhaps because they were afraid that the secret letters would be inspected or something else, to avoid arousing suspicion, the contents of the twelve letters that were deciphered were all plain family letters. These secret letters used the presence or absence of a horizontal line between words to represent one and zero, and then used punctuation marks to separate them, thus introducing binary numbers, and then using the Thousand Character Classic as a code book, so that they could be easily deciphered.
And the last letter, just a piece of paper with dozens of words, was completely incoherent and could not even be called a sentence. The writing style was like a child's doodles. At the end there was a note in beautiful handwriting, saying that the child was practicing writing by copying the words in the Thousand Character Classic. Although it was a bit childish, it was interesting to read, so the letter was sent to her husband who was in the army.
Seeing the three words "Thousand Character Classic", Zhang Shou smiled slightly, thinking that this might be another letter that used the Thousand Character Classic as a code book, but the encoding method was different from the previous twelve letters. Although a lot of random words were used, if the encoding method of the previous twelve letters, which seemed complicated but was actually simple, was used, this secret letter would not be that complicated in theory.