Chapter 6 Chapter 6: The Genius Password Girl

In the early morning of the next day, Mu Jianquan and Luo Xianzi had just had breakfast when the postman delivered a letter.Mu Jianquan took the letter and looked at it. Seeing the postmark on the express envelope, he knew it was from Sichuan, and the handwriting was very elegant, revealing the delicateness and fragrance of women. He said happily, "It must be written by Jianying." Luo Xianzi said happily: "Take it apart and have a look." Wang Ma, who was packing the tableware, also said happily: "Miss has just left for a few days, but I miss her a lot. I wonder what she wrote?" He finished his work and stood aside to read the letter; the servant Liu Bingde was wiping the handrail of the stairs, and he also turned his head sideways, seemingly reading the letter intentionally or unintentionally.

After Mu Jianquan unwrapped it, he unfolded the letter, and lines of elegant handwriting appeared in front of his eyes: After reading the letter, Mu Jianquan couldn't help but let out a long sigh, recalling the beautiful and intelligent Jianying, tears flowed from his eyes.He'd never regretted anything he'd done before, and now he regretted letting her go.Because of his sudden annoyance, his mind went blank, and he didn't even hear Luo Xianzi's words, "This handwriting doesn't seem to be Jianying's." But this sentence caught the attention of Wang Ma and Liu Bingde.

In the Military Control Bureau in Nanjing, Mao Renfeng came out of the translation room with a folder, hurried to the door of Dai Li's office, stood at attention and shouted: "Report!" Dai Li said: "Come in." Mao Renfeng opened the door and went in, stood still and opened the folder: "Section Chief Yang sent an urgent call from Shanghai." Dai Li sat on the chair and closed his eyes tightly: "Read!" Mao Renfeng Feng immediately read: "Chu Zuo Jun Jian: According to the investigation of Ms. Chrysanthemum, someone wrote a letter to her brother Mu Jianquan under the name of Mu Jianying. .”

After Mao Renfeng closed the folder, seeing that Dai Li was silent, he said, "Virgin, does this matter of the Mu family have anything to do with the case we are investigating?" Dai Li said, "It has a lot to do with it. Station power generation, looking for Mu Jianying across the country, you must find it." Mao Renfeng said: "Yes!" At the same time, in the basement of the Wanjuan Bookstore on Nanjing Road in Shanghai, Huang Yifu asked anxiously: "Why is there no news about Comrade Chen Jing?" Li Dahu said angrily: "Can she come back after this trip? People send people to the tiger's mouth for personal reasons!" Wang Ling said: "What do you mean?" Li Dahu said: "I only know that Sister Chen's boyfriend is very good, and there are many women who want to rob Sister Chen. That's normal."

Wang Ling sneered and said: "First, we were all born in the war years, and we are party members. Everyone may die one day. Why do you want to be a Communist Party member if you are afraid of death? Just her sister Chen's life is worth something? It’s a pity to die beautifully, and the tens of thousands of anti-Japanese fighters on the battlefield deserved their death? Second, I am not her superior, and she does not need to listen to my advice. I will let you assassinate Okamura Ningz, you Are you going? Third, I’ve never met her boyfriend before. Whether he’s good or not is none of my business. The man I’m interested in hasn’t been born yet! No, if there is one, it’s Mu Jianquan, but He is the sweetheart of my good sister, a gentleman does not take away people's love." These words made Li Dahu speechless with anger, "You...you..." He knew Wang Ling was eloquent, and he couldn't argue with her, so he held his hand. He clenched his fists and wanted to hit her, but he could only snort and ignore her.

Huang Yifu said at this time: "Comrade Xiao Wang, there are some things that you really should explain to everyone." Li Xiaohu also said: "Yes, last time we got the news that Yoshiko Kawashima and 'Xiaoxue' and 'Bingxue' were going to participate in the 'Flying Snow' Snow Operation's important information, but you said that the superior asked us not to investigate this clue, and gave you some important personal tasks, which is difficult for us to understand." Wang Ling said: "Then I wonder if Commissioner Yu has asked his superiors for verification, maybe he can Explain to you." Li Dahu was still unconvinced and said: "I also heard from Guo Defu that you often go out recently and don't pay attention to such important things as deciphering codes. What are you doing?"

Wang Ling smiled and said: "You can think whatever you want, I can only tell you that Chen Jing is still alive, someone will find a way to save her. And Mu Jianying just had an accident now, we have to find her as soon as possible. Of course, if you think that I am looking for her out of a friend's selfishness, you can take it seriously." Huang Yifu said: "What kind of talk is this, everyone is my own comrade, and no more conflicts are allowed in the future. We will Do your best to find Mu Jianying." After speaking, he walked out of the basement with Li Dahu and Li Xiaohu.

Yu Shaoyun hadn't expressed his opinion just now, and now he looked at Wang Ling with concern, and said, "Comrade Wang Ling, my intuition tells me that you are a very good espionage officer, since the superior has assigned you a special task, you should You must be brave enough to complete it. I admire your calmness and intelligence. The superior did not choose the wrong person. Although there are many things we don’t understand now, I absolutely believe in your loyalty to the party. Due to the special nature of our work, It is inevitable to be misunderstood by your comrades, but there will be a day when the truth will be revealed."

After hearing this, Wang Ling threw herself into his arms, burst into tears, and cried for a while: "Thank you, Special Commissioner. In fact, compared with some comrades, especially those who broke into the enemy's interior, everyone misunderstood me. Your grievances are insignificant." He stood aside, wiped away his tears, and continued, "One day they will understand." Yu Shaoyun said: "No, some of them already understand your loyalty very well." Wang Ling asked in surprise: "What does the special commissioner mean?" Yu Shaoyun said: "Last time you said that your superiors entrusted you with an important task, Also asked me to connect with No. '01' of the Central China Intelligence Department. No. '01' said that he had infiltrated the Central Command's special agent '301' and found out that a Central Commander codenamed 'Whirlwind No. 5' had sneaked into you. Agent, that’s why I entrusted you with the secret task alone, and entrusted me with the task of tracking down the spies.”

Wang Ling asked in surprise: "Is this news reliable?" Yu Shaoyun said: "'301' and '401' are the two ace spies in the hands of '01'. reliable." Wang Ling asked in puzzlement, "Then why didn't this traitor betray our group?" Yu Shaoyun said: "Because this person is the enemy's trump card spy who broke into our interior. In order to lurk for a long time, he even wants to be promoted to our internal high-level organization, so that he can play a greater role in the future. So this spy will not betray you. The team will also help you deal with the Kuomintang, provide you with some real information, and even kill some of their own people, so as to win your trust. In short, what he usually does is within the scope of your work. Xu Zhaolin, the mayor of the Shanghai District, contacted him directly, because we have recently been very strict in the review of comrades who join the party, and it is very difficult for the enemy to break into our interior. He was exposed by making small profits. This kind of spy is much more terrifying than ordinary spies, and it also hides the deepest. It is very difficult to dig out. This time it is because of the "Operation Feixue" that the Central Command responded I am also very interested in the case, and I want to start with us, so I activated this trump card and found some clues for '301' and analyzed it."

Wang Ling said: "This is simply terrible. The longer this time bomb is buried, the greater the power of the explosion. There are only six people in our group, Huang Yifu, Guo Defu, Li Dahu, Li Xiaohu, Chen Jing and me. Who will it be?" Woolen cloth?" Yu Shaoyun said: "Anyone is possible except you, that's why the special committee entrusted you with the task of one-way contact with 'Kangaroo No. It is also necessary to decipher the code, so let me complete the task of tracking down the spies alone." Wang Ling said: "I have joined the party for the shortest time, and I am only a student who has just graduated from middle school. Why do my superiors trust me?" Yu Shaoyun said: "Since your parents were killed, our people have been secretly protecting you and cultivating you. As the successor of the revolution, only you have the most innocent history. And according to our analysis, this spy is the murderer who killed your parents back then." After hearing this, Wang Ling looked a little heavy, "Really? I understand, Special Commissioner, I have a way to find out this traitor." Yu Shaoyun said happily: "What way?" Wang Ling said: "This strategy will definitely work. However, when this spy pointed a gun at me, you must not care about my life and death, and shot him." Yu Shaoyun tremblingly said: "This...can you explain it clearly?" Wang Ling whispered in his ear so and so... However, Zhao Libiao and Wang Kejin were shocked when they learned that Shen Xuehua and others failed to assassinate Mu Jianquan, and hurriedly discussed countermeasures with Yang Jirong. Zhao Libiao said strangely: "We sent all the elites of the party-state, but we didn't expect that all of them would go to the tiger's mouth as soon as they went." Wang Kejin slapped the table and said: "There must be traitors here, our actions are top secret." Zhao Libiao thought about it and said, "Except for the operatives, only the three of us know. Could there be a traitor among the three of us?" Wang Kejin said, "Of course it's impossible, I just find it strange." Yang Jirong said: "Because of the particularity of our work, it is almost impossible to keep one thing absolutely secret. After this painful lesson, we must be cautious in doing things in the future." Zhao and Wang The two said in unison: "Yes!" Yang Jirong continued: "Tomorrow night, the city government will hold a banquet for Mu Jianquan in the Asia Hotel to reward him for his great contribution to Shanghai's charitable causes. Not only will celebrities from all walks of life participate, but spies from various countries will also get in there." .” Wang Kejin excitedly said, "Where should we attack?" Yang Jirong said, "No, killing Mu Jianquan won't do much, besides, in Shanghai, except for the spies who are aware of his evil deeds, everyone regards him as a villain." Great good man, worship him as a god. If you kill him, it will add a lot of pressure to us. If you want to kill him to avenge our people, there will be opportunities in the future. We must pay attention to everyone present, I believe there will be accidents reward." At ten o'clock the next morning, Guo Defu, Yu Shaoyun, Huang Yifu, Li Dahu, and Li Xiaohu entered the basement together.Seeing that Wang Ling was burning some documents, all of which were written in military terminology and some important names of people and places, Yu Shaoyun asked first: "What are you doing, kid? Didn't you say that you have good news to tell everyone?" Wang Ling smiled and said: "Extremely good news, the code of 'Operation Flying Snow' has been deciphered. What I burned were the waste manuscripts used to decipher the code these days." Li Dahu said happily: "What is the content?" Wang Ling said: " I have already reported to the superior, and the superior asked me to keep the secret for the time being." Yu Shaoyun pretended to show displeasure, "Do you want to keep it a secret from us?" Wang Ling said: "It is ten o'clock, and I cannot tell you for at least two hours " Li Dahu said: "Why is that?" Wang Ling said: "Because the Japanese secret service's 'Operation Flying Snow' will be successfully completed at 12 noon today." Li Dahu wondered: "Then why do you keep a secret? You should tell Everyone, we can destroy the enemy's conspiracy." Wang Ling said: "You can rest assured about this. What I can also tell you is that the 'Operation Feixue' has nothing to do with us. It was done by the Japanese against the people of the Kuomintang military command and the Central Command. Yoshiko Kawashima's plan is absolutely perfect. In two hours, an earth-shattering event will break out in Nanjing, and the two major secret service agencies of the military command and the central command will be wiped out." Huang Yifu said happily: "This is really great, the Kuomintang spies killed so many of our comrades , it would be a good thing for us if they were wiped out by the Japanese." Li Dahu said anxiously: "But now that the Japanese army is approaching, we Chinese should unite to deal with the Japanese. The actions of the military command and the Central Command are certainly hateful, but if they are wiped out, it will be a great loss to our national defense power after all. "Wang Ling said: "If it is the anti-Japanese army of the Kuomintang, of course we will help, that is the friendly army of the Anti-Japanese War. But the military reunification and the central reunification will only bring resistance to the war of resistance, and even destroy the cooperation between the Kuomintang and the Communist Party. They were wiped out, and our two parties Only then can we truly unite and fight against each other.” Li Dahu said she was no good, and then asked: "Are the Japanese spies really capable?" Wang Ling said: "It's hard for you to believe what I say now. In short, two hours later, the whole world will be shocked by Yoshiko Kawashima's masterpiece. I Although I don’t know anything about military affairs, judging from the contents of Operation Flying Snow, both the military command and the central command will definitely be completely ruined.” Li Dahu asked: “Is it true that the military command and the central command have no hope of victory at all? ?” Wang Ling said, “Unless they can decipher the code of ‘Operation Flying Snow’ before twelve o’clock.” Guo Defu said: "Then I will come to hear the result in another two hours. I have to go up and look at the bookstore." Li Xiaohu said: "If there is nothing else, then I will go up first." down the basement. Wang Ling and Yu Shaoyun looked at each other, thinking: "These two people don't care about this matter, we can rule it out. Now only Li Dahu and Huang Yifu are left. If these two people don't care about it, then it might be Chen Jing .” Standing beside Wang Ling, Yu Shaoyun held a pistol in his right hand and tucked it in his sleeve. He watched Li and Huang. Once he found someone who made a move, he could strike first. He said to Wang Ling with a smile: "Then I'll sit here with you for two hours, and I can take this opportunity to learn password knowledge from you." Wang Ling handed him a copy of "Three Hundred Tang Poems" and said: "These three hundred ancient poems are compiled There are thousands of sets of passwords, the commissioner can take a look first." Both of them were nervous, but they both pretended to be nonchalant. Yu Shaoyun took the book with his left hand and opened it to read. Huang Yifu praised: "Our Comrade Xiao Wang is indeed better than the experts in the 'family'. He has made great achievements this time, and he must be rewarded." He sat down to copy flyer tagline.Wang Ling said, "Thank you, Team Leader Huang." Li Dahu was not as patient as these two leaders, he kept asking Wang Ling about the content of "Operation Flying Snow", and even quarreled with her.While persuading, Yu Shaoyun stared at Li Dahu's hands.As time passed minute by minute, Li Dahu was gradually persuaded by Wang Ling, but he still did not take any action. Yu Shaoyun's intuition made him turn to look at Huang Yifu, and suddenly saw him raise his gun and turn around and stand up.Yu Shaoyun was shocked. If he shot at him, Wang Ling would be killed by Huang Yifu.Yu Shaoyun was quick and wise, and took the first step, hooked Wang Ling's neck with his left arm, and pointed a gun at her temple with his right hand, just as Huang Yifu's gun was also aimed at Wang Ling.Li Dahu, who was terrified, mistakenly thought that Huang Yifu was trying to prevent Yu Shaoyun from committing a crime, and drew his gun at Yu Shaoyun. Yu Shaoyun said: "Don't move either of you, or I will kill her." Wang Lingxue was smart, and her thoughts changed, and she understood that Yu Shaoyun changed the plan to save her, and she also responded immediately when the situation changed. Cooperating with the scolding: "Yu Shaoyun, who are you? What do you want to do?" Yu Shaoyun said coldly: "I am an agent of the military command, you didn't expect it, please tell me what is the content of 'Operation Feixue'? " Wang Ling cooperated and said: "Team Leader Huang, Dahu, shoot at him quickly, and don't worry about me." Yu Shaoyun said to Li and Huang, "Put down your guns quickly." Li Dahu gritted his teeth reluctantly. Put down the gun. Huang Yifu turned his gun, pointed at Li Dahu, and said: "Commander Yu, I didn't expect that you are also an elite of the party-state. I am a member of the Central Committee. It seems that we have to..." Yu Shaoyun sneered: "You think you Is it possible to deceive me by playing such small tricks?" Huang Yifu said: "It's hard for me to explain to you now, we'd better take Wang Ling away first. When we get there, our people will find a way to get her Open your mouth and say the content of 'Operation Snow'." Yu Shaoyun said: "If you want me to believe you, you can shoot and kill Li Dahu first." Wang Ling was startled, but she heard Huang Yifu say: "When the gunfires, the people above will come down, and we won't be able to get out. It's gone." Wang Ling admired Yu Shaoyun's brilliance of taking advance as retreat, and even more admired him for his accurate grasp of the opponent's psychology.Li Dahu heard Huang Yifu say that he dared not shoot, so he punched him. Huang Yifu turned sideways, turned his left hand up, grabbed his wrist, twisted his strength, and threw him to the ground, and stepped on him again. On his chest, these rabbits rose and fell, and the gun in his right hand was always pointed at him. Yu Shaoyun said: "Then you kill him with a knife, and we knocked Wang Ling unconscious, saying that she was suddenly ill, and we took her away under the pretext of sending her to the hospital. But let's be clear first, this matter is due It can be returned to our military command." Huang Yifu said: "Okay, everything is up to you." He was about to stretch out his left hand to draw the dagger from his body, but Li Dahu grabbed his left hand, so he had to put the gun on the table, and use his right hand from his waist Pulling out a military dagger, he was about to bend down to kill Li Dahu.But seeing Yu Shaoyun let go of Wang Ling, pointed his gun at Huang Yifu's head, and shouted: "Whirlwind No. 5!" Wang Ling said relaxedly: "I didn't expect you to show your fox tail with a little trick." Huang Yifu sneered: "It turns out that this is just a trap. I didn't expect that I, a senior agent, would fall into the hands of a little girl." superior." Guo Defu and Li Xiaohu above suddenly heard a gunshot below and rushed down with their guns. Huang Yifu was shot in the head and fell to the ground... Wang Ling looked at Huang Yifu who was lying on the ground, and thought of his parents who were killed by him. She couldn't help being lost in silence and shed tears, feeling that now she could finally comfort her parents' spirits in heaven.After a while, she sighed, "Now I can tell everyone the content of 'Operation Flying Snow'." Yu Shaoyun asked excitedly: "Have you really deciphered the code?" Wang Ling happily handed it to him. A stack of manuscript paper, "Look at it for yourself." Guo Defu, Li Dahu, Li Xiaohu and others also joined together.Although the manuscript has been sorted out by her in detail, outsiders still find it particularly profound. After comparing a large amount of data, Wang Ling gave up the method of trying to open a breakthrough through Japanese at first, and determined the content of the secret message as English content.English is a common language in the world. Japanese embassies and consulates are located all over the world. It is natural to use English letters to send and receive telegrams. Therefore, many telegrams in Japan are sent in English. Her deciphering method is this: the first step in deciphering is to use the frequency characteristics of language.In various alphabetic languages, the frequency of use of each letter is different, some are high and some are low.After investigating a large number of English materials, the American cryptographer Friedman came up with the table 1 of the common use frequency of English letters: Although there are special exceptions, such as the 200-page novel "Escape" written by the French writer Georges Perec in 1969, there is not a single word containing the letter E.And after being translated into English, there is actually no letter E.This is indeed a miracle.Since the most common letters in the English alphabet do not appear at all, if this book is used as a cipher base for single-letter substitution encryption, deciphering will be greatly hindered.But generally speaking, the frequency of use of each letter in the written English articles is basically consistent with the statistical data in Table 1.It can be seen that E has the highest frequency of common use in English, which is equivalent to an average of 1,304 occurrences in 10,000 letters, while Z has the lowest frequency of use, which is equivalent to an average of 1,000 occurrences in 10,000 letters. eight times.In addition, in terms of word usage frequency, the definite article the is the most frequently used, followed by proper nouns and pronouns such as it, and prepositions such as in and on are also used frequently.From the perspective of the distribution of letters in words, there are also some rules. Ninety percent of the total use frequency of the letter Y is concentrated at the end of the word, and ninety percent of W is concentrated at the beginning of the word. P and C There are more at the beginning of the word and less at the end. R appears more in the middle of the word. J and Q do not appear at the end of words other than abbreviations. There are only two words in English that are composed of single letters, namely A and I.In addition, there are many similar frequency features. Cryptographers have also conducted statistics on the frequency and usage frequency of letters in languages ​​such as Japanese, Russian, German, Italian, Portuguese, etc., and have also obtained similar usage frequency characteristics, and made corresponding common usage frequency tables. The following is the frequency of each letter in the ciphertext calculated by Wang Ling: Table 2 This ciphertext has a total of 893 letters, so it is easy to calculate the frequency of use of each letter.Then perform an explicit comparison. However, it does not mean that it is enough to simply replace the ciphertext letters with English letters with similar frequencies, because in general, the frequency of use of these ciphertext letters in the ciphertext will not depart from the plaintext letters they represent The frequency is too far away.As can be seen from Table 1, plaintext letters E, T, A, O, N, R, I, S, H can be called high-frequency letter groups, and D, L, F, C, U, M can be called intermediate frequency Letter groups, G, Y, P, W, B, V can be called low-frequency letter groups, and K, X, J, Q, Z are rare letter groups.Moreover, there is an obvious frequency jump from the medium-frequency letter group to the high-frequency letter group. The letter H with the lowest frequency in the high-frequency letter group is 0.0528, and the letter D with the highest frequency in the medium-frequency letter group is only 0.0378.Such mutations between letter groups of different frequencies should have corresponding performances in the frequency statistics of ciphertext letters.Arrange the ciphertext letters in order of frequency from most to least. It seems that the dividing line between the high-frequency letter group and the medium-frequency letter group should be between N and D: the boundary line between the medium-frequency letter group and the low-frequency letter group is probably between E and O , although the IF alphabet group should be six, but now there are only five.The dividing line between the low-frequency letter group and the rare letter group is probably between M and H, although the low-frequency letter group should be six, but now it is seven, so a conclusion is drawn: one letter missing in the medium-frequency letter group is likely It is the one with the most low-frequency letters. table 3 In particular, the letter Y is likely to represent the most commonly used letter E, and the lowest letter N in the ciphertext high-frequency letter group may represent the plaintext letter h.The remaining letters H, Z, C, and T in the ciphertext (the letter Q does not appear in the ciphertext) are likely to represent the rare letter groups K, X, J, Q, and Z in the plaintext, but which one represents which one is still unknown. have no idea. Now let's take advantage of the second breakthrough - the connection feature of language.In English, the letter Q is almost 100% connected with the letter U except for the ellipsis, which is the post-connection mode in the connection feature.In addition, some letters are almost always connected with a few letters in front of them: I and E are generally connected in front of X, and O and A in rare cases.There is also a discontinuous connection mode, and the frequency of R is the highest between E and E. Statistical table for the classification of the connection times of higher frequency ciphertext letters: Table 4 In the first column (Y96), G is preceded by a number 3, indicating that the letter Y appears three times before the letter G, that is, the letter pair YG appears three times in the ciphertext. G is followed by the number 4, indicating that the letter pair GY appears four times in the ciphertext. It can be seen from the data in the table that the ciphertext letter Y not only has the highest frequency, but also connects with many different letters. It can be confirmed that Y is the plaintext letter e represented. The three letters E, T, and A that have a particularly high frequency in the plaintext are the four letters Y, G, L, and W that have a particularly high frequency in the ciphertext.Assuming that the replacement letters of these three plaintext high-frequency letters are among these four, and Y is known to represent E, then T and A are among G, L, and T.In high-frequency letters, vowels often appear before and after most letters, while consonants avoid most letters.Just as the letter E can be combined with any letter, the letter J rarely appears on both sides of the letters B, D, G, J, K, M, Q, and V.It can be seen from Table 4 that the connection characteristics of the three letters G, L, and T, and the connection between W and other letters are particularly small, so it can be concluded that the letter W represents the consonant letter T.Then one of G and L represents A.Coupled with the fact that N may represent H, we can know that WNY represents the word the. In addition, the connection characteristics of the three high-frequency original letters A, I, and O in the plaintext are: the total number of connections with other letters is relatively large, but they always avoid connection with each other.Observing the statistical table 4, since the letters Y and W have been inferred, the three letters G, L, and I arranged at the top with these characteristics are selected to be assumed to be A, I, and O.But which one represents which is unknown.Therefore, it is determined according to the phenomenon that the frequency of io in the plaintext is relatively high, while the frequency of oi, ia, ai, oa, and ao is very low.Statistical Table 4 shows the frequency of corresponding letter pairs in the ciphertext, GL2 times, LG8 times, GI9 times, IG3 times, LI2 times, IL3 times, so it can be assumed that GI=io occurs nine times, so L=A. The most characteristic of the plaintext consonant letters is the letter N, because four-fifths of its preceding consonant letters are vowel letters. In Table 4 of the consonant letter statistics, there are more letters connected in front of the ciphertext letter J Y, G, I, L occupy sixty-two out of seventy-three times, so it is obtained that J represents N. There are many different methods for the inference of some letters, and the accuracy of the inference results can be more determined by verifying different methods.For example, for N (representing H) and W (representing T) that are already roughly known, another method can be used to verify.In the connection statistics table 4, the characteristics of N are also obvious. It is always connected in front of Y (which has been determined to be E) for twenty-three times, but it only appears once after it. H has exactly the same characteristics, he is one of the most common letter pairs in English, and eh is very rare, which also proves that N is likely to represent the letter H.In addition, in Table 4, N is as many as 21 times behind W, but has never appeared behind it. th is also the most common letter pair in plaintext, but ht is very rare, so the ciphertext letter W is very likely Yes stands for T.There is another way to further verify that the letter H in plain text is just the opposite of N, and it precedes vowels about ten times as often as it follows them.In connection statistics table 4, it can be seen that the number of times of the ciphertext letter N before Y, G, I, L is 37 times, and the number of times behind it is three times.Through the verification of these aspects, it is basically certain that N represents H and W represents T. Of course, although the deciphering of the password requires the knowledge of mathematics, after all, it is impossible to prove every step like doing a math problem.More assumptions are needed, and luck is needed. For example, after delineating some letters to represent certain letters, you can assume that a certain letter represents a certain letter. The letters are substituted into the ciphertext, and the deduction goes on step by step. If you are lucky, you may go right every step smoothly. If you make a mistake, you have to start all over again.It’s like a student doing a multiple-choice question with one of four choices. When they can only rule out two of the options based on the knowledge they have mastered, the rest can only rely on luck to choose one of the other two options, but if they choose the wrong one, they will fail.Fortunately, after the selection of this link of this type of password deciphering, if it is found to be wrong in the continuing work, it is successful to go back and re-select. Now substitute all the recognized letters into the ciphertext, and the result of substitution is as follows: SGRLSIWIGJ RIFDUGAYVNGJLNYLETFLDWYDBNLB I a ot o in o I eh ina hea ate ha EYVGEYEWIBIIJALFJVNLUFAABVLAYIUUYJBGKYW eie to oon anhaa eo en i et NYLWWLVH MGAA OY WNY UGDBWVNIGVYGJJIDW he atta I e theit hoi e in no t NVNGJLJIDWNVNGJLLUWYDWNYMLDBNLJPNLG MG h hina no thhina a tet hea hang hai i AA OYVISYWNYUIVFBIULWWLVHIJIFDSGAGWLDRIO eoe the o atta ono ii ita o ZYVWGKYBBNLJPNLGLAAIUWNYSGAGWLDRGJWYA e ti e han hai aotheiitainte AGPYJVYIXYDLWGIJBWNYLDSRLJEJLKRIUWNYGJW i en eo eati on the a an nao t he i nt YAAGPYJVYLPYJVGYBNLKYVIAAYVWYEKYDREYWL ei en ea en ie ha eoeteet. GAYERIFJYYEWIVISXAYWYEORWNYEYXLDWSYJWBS ieon ee to oe tet he eat en t GBBGIJGBWILBBGBWGJWNYVISXAYWGIJIUBJIMVNF iion I to ait int he oe t iono no h LJELIULJPCGXALJIU LVWGIJBNLJPNLGVYAYODGWGY an ao ani ana tion han hai e ei tie BUDISLAAMLAHBIUAGUY MGAAXFAAIKYDYKYJ GU oa ao ieioee en i GVLJJIWOYFBYEOFWLABILBULDLBXIBBGOYAWNYG I a nnot e et aoa aao ie the DBWLRGJBNLJPNLGYKYJGUGWGBWIWDRWINYAXW ta in han hai eeniiti to tto het NYSAGKYJYLDWNYODGWGBNLJEUDYJVNVIJVYBBG h eI enea th eI t I hanen h on ei IJGJIDEYDWIDYWLGJWNYLDSRBWLWGIJYEGJBNLJ onion eto et ain theatat ione in han BNLJPNLGLUWYDWNYXIAGWGVLALJEYVISJISGVVL han ha ia tetheo it I aaneo no ia XGWLAGUGWVLJJIWOYAYUWOYNGJELJEHGAAWNYS it aiit annt eeteh I na nit he LAAVNGJLBOFDYLFIUGJKYBWGPLWGIJLJEBWLWGB ah i na ea o in etiat ionan tati WGVBIUWNYSGAGWLDRVIFJVGALJEWNYVISSGBBGIJ t I o th eiitaoni an theoi ion LJEWNYVNGJYBYVISSFJGBWBXGYBWIWLHYVIDDYB anthehi ne eoni ti etotaeoe XIJEGJPSYLBFDYBOFWBNIFAEWDRWILKIGELSLZIDV on in eae t ho ttoa oi aao IJUAGVWMNYJLAAWNYSLGJLVWGIJBYVDYWVNFJL on ithe nat he ain at on eeth an, ELIULJPCGMGAAVISYWIBNLJPNLGUIDLAAXDIZYVW ao an I io e to han hai oaoet BLJEBIAYARDYBXIJBGOAYUIDNYD. An o ee on I eo he. In this way, it is already very clear. According to some specificities of English words and sentences, it has been possible to gradually assume the words that should be filled in certain positions.For example, through the previous proof, we already know that the GJ letter pair represents the word in, and WNY represents the word the and several other confirmed words, we can divide the letter string connected like a long snake, and roughly separate the location of some letters. The position of is the last letter or the first letter of a word.For example, if the letter pair GJ at the beginning of the ciphertext corresponds to the letter string SGRLSIWI in front of the ciphertext letter is -ia-oto, it can be assumed that the letter string SGRLSIWI is the word Miyamoto.If so, there is S=m, R=y.The ciphertext letter string corresponding to the letter string VNGJL is -hina, so it can be assumed to be the word China, so there is the letter V=c.After filling in these newly introduced plaintext letters, other letters can be deduced accordingly. This is the simplest guessing method in password deciphering.When students are learning English, they often do similar exercises to fill in complete words based on some letters of known words. Finally, after step-by-step assumptions and substitutions, I finally found out all the letter substitution tables: table 5 So a complete message can be obtained: Miyamoto in your file: China headquarters has decided to soon launch a full-scale offensive, the attack will be the first choice in North China, North China after the war, Shanghai will become the focus of attack on our military objectives. Shanghai All of the military intelligence operations, the Army and Navy of the intelligence agencies have collected very detailed. You need to complete by the Department's mission is to: assist in the completion of snow Chuan dao fang zi plan of action. Shanghai celebrities from all walks of life will pull over, even if I can not be used, but also as far as possible their stay in Shanghai, even if it is to try to help them live near the British and French concession in order to retain The army stationed in Shanghai after the political and economic capital. If it can not be left behind, and kill them all. China's Bureau of Investigation and Statistics of the Military Council and the Commission and the Chinese Communist spies to take corresponding measures, but should try to avoid a major conflict, when all the snow in the main action. Secret Chuan dao fang zi will come to Shanghai, for all projects and solely responsible for her. Then translated into Chinese is: His Excellency Miyamoto: The base camp has decided to launch a full-scale attack on China. The preferred location for the attack will be North China. After the war in North China, Shanghai will become the key target of our army's attack.The intelligence agencies of the army and navy have collected all military intelligence about the Shanghai operation in great detail. The task you have to complete is to assist Yoshiko Kawashima to complete the "Operation Snow" plan.Pulling celebrities from all walks of life in Shanghai, even if they can't be used by me, I should try my best to keep them in Shanghai, even if I try to let them live in the British and French concessions, so as to preserve political and economic capital for our troops after they are stationed in Shanghai.Those who cannot stay will be killed.Corresponding measures should also be taken against China's military and central government and the CCP's spies, but major conflicts should be avoided as much as possible, and everything should be based on "Operation Snow".Yoshiko Kawashima will come to Shanghai secretly, and she will be fully responsible for all plans. Wang Ling thought about it and continued talking to herself: "However, what I find strange is that this kind of password is so simple that I never thought of using simple mathematical methods to decipher it at first. It stands to reason that it is impossible to use such a simple password for military communication passwords now, especially after the Enigma cipher machine came out in Germany, the Japanese also bought this cipher machine from Germany. I heard that they are still developing on the principle of the Enigma cipher machine A more confidential purple secret. Although limited by conditions, it is impossible for a large number of communications to have the opportunity to use the expensive and rare Enigma cipher machine or purple secret to encrypt, but even if it is a manual password, it should not be so simple. Yes. Our party uses manual ciphers, but of course the security is very high.” A few people obviously didn’t pay attention to what she said about the professional aspects of ciphers. Guo Defu said: "Actually, we have noticed what the Japanese are doing. We just didn't know it was 'Operation Feixue'." Yu Shaoyun said: "The situation is complicated now. The celebrities and wealthy businessmen from all walks of life in Shanghai are mainly divided into three factions. : One faction, out of security considerations, either buried the means of production secretly, or moved to the interior under the call of the Kuomintang;国难财，暗中与日本人勾结。那些想走的人，日本人却想留住他们甚至暗杀，我们应该帮助保护他们离开；那些或公开，或秘密投靠日本人的人，迟早都不会有好下场的！” 王玲正色道：“现在内奸已除，密码已破译，经上级同意，有些事也可以告诉大家了。住在沐涧泉家的罗显紫就是川岛芳子，也就是'飞雪行动'中的代号'飘雪'的间谍。”几人听了无不大惊，余劭昀道：“这怎么可能，她的相貌……”王玲道：“就因为很多人都认识她，她为了亲自参与'飞雪行动'，所以才回日本做了面部整形手术。'袋鼠二号'早就将这一情报提供给了我们华东情报部。” 李大虎问道：“那'袋鼠二号'又是谁？”王玲道：“我也一直都很想知道他是谁，不过到现在我都没有见过他，我跟他之间采用的是不见面接头。我们每次都是把情报密写在招工启示和寻人启示上，贴在几处指定地点，等对方去取。但我分析他就隐藏在沐涧泉家里。可能是佣人或者保镖。因为他对川岛芳子和沐涧泉的一举一动都非常了解。上次我们商议去行刺沐涧泉。'袋鼠二号'居然事先都预料到了，他告诉我说如果要行刺沐涧泉，就得派陈婧去才能成功，他还可以保证陈婧能安全返回，若派其他人去，下场肯定和军统的人一样。所以我才坚持让陈婧去的，可是没想到她在路上就被日本人抓了。” 李小虎道：“那现在陈婧安全吗？我们该怎么救她？”王玲道：“'袋鼠二号'说沐涧泉很可能会杀了陈婧，不过他会尽最大的努力救她的，还说如果救不了，那……他也会跟着一块儿死。” 余劭昀道：“原来川岛芳子隐藏在沐家就是为了笼络沐涧泉归顺日本人。”郭德福道：“日本人笼络那些名人都是由那些普通特工去做的，为什么笼络沐涧泉还要川岛芳子亲自出马？” 王玲分析道：“川岛芳子的代号是'飘雪'，我想另外两名大特务宫本太郎和和久田幸助就是'小雪'和'冰雪'。”余劭昀赞同道：“你的分析很有道理。由于沐涧泉的父亲沐正英在商界的特殊身份无人能及，也就决定了他的特殊身份。所以川岛芳子要亲自接近他；而张啸林是上海黑帮三大头目之一，权势重大，另外两名头目黄金荣和杜月笙都受到蒋介石的器重，那宫本太郎亲自笼络张啸林也是情理中的事；而和久田幸助亲自接近的是胡蝶女士，胡蝶在中国的知名度谁都清楚。而其余的名人都没有这三人身份特殊，所以就是由一些普通的日特去接近。” 王玲道：“这三个人当中，沐涧泉和张啸林是完全投靠了日本人，无论是我们还是国民党的人都会对这两个人进行暗杀。而胡蝶就不同。根据情报，和久田幸助已多次邀请她去日本拍片，这可是有政治上的阴谋的。胡蝶在我国可是家喻户晓的明星，如果和日本军界的人搞到一起将造成可怕的社会舆论。不过胡蝶并没有同意，为了避免日本人继续纠缠她，我们应该暗中保护好她全家，或者劝她离开上海。不过，对于沐涧泉，我还是有我个人看法，因为我刚才对他的分析只限于表面现象……算了吧，我保留我的意见。” 余劭昀刚来之时见这位小姑娘天真烂漫，毫无心机，没想到几日来的相处才发现她机智过人，目光如炬，不由得微笑道：“上级果然没有看错人，我们的一个小同志都能识破日本人的奸计，小日本迟早会被我们赶出中国的。”王玲笑道：“特派员可是在取笑我了，我还有很多细节上的事情都不明白呢。”余劭昀问道：“什么事？” 王玲道：“还是沐家的事啊！沐涧泉与苦苦相恋四年的女友江婉萍为什么在沐正英死后就突然分手了？沐涧颖为什么会把所有家产全部转给沐涧泉？我那个老同学虽然从小就对她这个哥哥情根深种，但她是一个非常聪明理智的人，绝不会为了感情而辜负沐正英遗愿的，这其中必有原因。还有，根据情报，沐涧颖确实没有回老家四川，已经神秘失踪，她到底去了哪里？难道有人对她下了毒手？为什么会有人冒她之名给沐涧泉写了一封平常的信？为什么沐涧泉对那封信都没有怀疑？而'袋鼠二号'却断定那封信是假的？这个'袋鼠二号'到底想干什么？他对沐涧泉的生死毫不关心，却非常关心沐涧颖的安危，多次询问我有无沐涧颖的消息，他到底是敌是友？” 余劭昀奇道：“难道这个'袋鼠二号'并不是我们党内的同志？”王玲道：“没错。” 余劭昀更是不理解，问道：“那他为什么和我们之间有联系？”王玲道：“这就更奇了，上级说有一个神秘人物把他介绍给了我们的人。由于他给我们提供了川岛芳子这条情报和很多重要情报，所以我们虽然从没见过他，却一直在与他合作。不过上级命令绝对不能调查'袋鼠二号'是谁，但是一定要查出隐藏在我们与他之间的那个神秘人，因为根据情报，向我们提供会有人在火车站行刺沐涧泉这一情报的人很可能就是那个神秘人。” 郭德福道：“是不是敌人故意布下这么多的迷阵，把我们套在沐家的事情上，而他们的'飞雪行动'就能收效更大？”王玲摇头道：“也许是吧，可如果不是这样，那可能是案中有案了。”余劭昀道：“不管怎样，我认为我们还是应该以全面地反'飞雪行动'为主要任务，而只把沐家的事当做次要的去做。” 李大虎道：“我们小组里混进过中统特工，这里已经不安全，我们得赶快转移。”王玲道：“难道你不知道越危险的地方越安全吗？现在收发报量很大，其他小组的一些情报都要通过这部电台发出去，我们能找到一个更安全隐蔽的地方吗？何况黄逸夫与中统之间的联络时间周期比较长，若无重大情报，是不联络的，短时间内中统的人还不会知道他已经死了，也就不会对我们采取行动。”余劭昀点头微笑道：“小鬼的分析很有道理，不过大家一定要加倍小心，做好随时转移的准备。” 王玲想到好友沐涧颖至今还没有任何消息，不由得忧心忡忡，独自一人陷入了深深地思索当中。虽然成功地破译出了日本人的密码电报，但是凭着自己的密码知识，她更加感到其中有问题。仔细思索着沐涧颖教自己的一些密码知识：就连比她刚刚破译的这套密码复杂得多的维吉尼亚密码也早就被密码学家给破译了，自己以前在做密码练习题的时候也破译出了那样的密码，可日本人为什么还会用这样的密码？编制密码肯定要比破译密码容易得多，编制复杂点的密码也不是难事，日本人在这方面的水平可是很高的呀。她也相信上级机关的那些密码专家肯定在她之前就已经成功地破译出了这份密码电报。虽然她将破译后的密码内容发给上级后，上级告诉她说是她最先破译的，还对她进行了嘉奖。 维吉尼亚密码曾经称霸密码界近百年，一度被称为是不可破译的密码。它引入了“密钥”的概念，即根据密钥来决定用哪一行的密表来进行替换，以此来对抗字频统计。假如以上面第一行代表明文字母，左面第一列代表密钥字母，对如下明文加密： TO BE OR NOT TO BE THAT IS THE QUESTION 当选定RELATIONS作为密钥时，加密过程是：明文第一个字母为T，第一个密钥字母为R，因此可以找到在R行中代替T的为K，依此类推，得出对应关系如下： 密钥：RELAT IONSR ELATI ONSRE LATIO NSREL 明文：TOBEO RNOTT OBETH ATIST HEQUE STION 密文：KSMEH ZBBLK SMEMP OGAJX SEJCS FLZSY 历史上以维吉尼亚密表为基础又演变出很多种加密方法，其基本元素无非是密表与密钥，并一直沿用到二战以后的初级电子密码机上。 公元十六世纪晚期，想要获得更高的保密度的人获得了一种设计更加精细的密码表。 法国外交家Blaise de Vigene re发明了一种方法来对同一条信息中的不同字母用不同的密码进行加密。这样，同样的E在一个位置可能被M所取代，而在另一个位置的E则有可能以K的面目出现。这样，就可以防止任何人利用频率分析法解密该条信息。 在维吉尼亚密码中，发件人和收件人必须使用同一个关键词（或者同一文字章节），这个关键词或文字章节中的字母告诉他们怎么样才能前后改变字母的位置来获得该段信息中的每个字母的正确对应位置。比如如果关键字“BIG”被使用了，发件人将把信息按三个字母的顺序排列。第一个三字母单词的第一个字母将应当向前移动一个位置（因为B是排在A后面的字母），第二个字母需要向后移动八位（I是A后面第八个字母），而第三个字母需要向前移动六位（G是A后面第八个字母）。然后，文字就可以按下面的顺序来进行加密了： 未加密文字：THE BUTCHER THE BAKER AND THE CANDLESTICK MAKER。（屠夫、面包师和蜡烛匠）。 关键密钥：BIG BIGB IGB IGBIG BIG BIG BIGBIGBIGBIGBI GBIGB 加密文字：UPK CCZDPKS BNF JGLMX BVJ UPK DITETKTBODS SBSKS 如果知道“BIG”就是密钥，收件人就可以很容易地通过相应的位置改变字母位置，从而译出经过加密的文字。 自从频率分析法出现后，单字母替换密码完全失去了效用。因此，密码编码者想方设法去编一种更强大的密码。一些编码者对单字母替换密码做了一些改动，如在编码过程中，加入一些特殊的字符，或者令一些字母不代表另一个字母，而是代表一种程式，譬如是代表空格，代表删去前一个字母，代表换行等。但这一切起的作用并不大，聪明的破译师仍然能在里面找到许许多多破译密码的线索。直到有一天，佛罗伦萨的里昂巴蒂斯特·阿尔伯提提出了一种多字母替换密码，即用两个或两个以上的密码表交替使用来进行加密，如： 明码表ABCDEFGHIJKLMNOPQRSTU VWXYZ 密码表1 QWERTYUIOPASDFGHKJLZX CVBNM 密码表2 EKPRJBDNCVOUHTYWZXMLA SFIGQ 第一个密码表加密第一个字母，第二个密码表加密第二个字母，第一个密码表又加密第三个字母，不断地重复……那么： 明文FOREST 密文YYJJLL 这样，按原来的方法进行频率分析就没有什么作用了。这只是两个密码表时的情况，如果用三个、四个或以上的密码表后，破译就显得非常非常困难。即使是这样，阿尔伯提未能把他的理念发展成一个完整的系统。这个任务当然由后人完成了。经过几个人的努力，最后，维吉尼亚终于将其完善了。他编出了一个系统而有效的密码，那就是维热纳尔密码，其主要构成是维吉尼亚方阵： 它的明码表后有二十六个密码表，每个表相对前一个发生一次移位。如果只用其中某一个进行加密，那么只是简单的恺撒移位密码。但用方阵中不同的行加密不同的字母，它就是一种强大的密码了。加密者可用第七行来加密第一个字母，再用第二十五行来加密第二个字母，然后根据第八行来加密第三个字母等。 现在来试一下，就用关键词FOREST来加密Better to do well than to say well。 关键词FORESTFORESTFORESTFOR ESTFOR 明文bettertodowellthantos aywell 密文GSKXWKYCUSOXQZKLSGYCJ EQPJZC （看第五行，F开头，明文是b，要用G来加密；第十四行，O开头，明文是e，要用S来加密，如此类推……） 维热纳尔密码既克服了频率分析，又具有数目众多的密钥。发送者和接收者可使用字典里任一个单词，或单词组合，或虚构的词作为关键词。它提供了很好的安全保障，但它的复杂性，却令其等到十九世纪才流行起来。很多年以来，维吉尼亚密码都被认为是不可破解的。不过，也是在十九世纪，查尔斯·巴贝奇——一个性情古怪的天才将其破译了。让我们来看看解密的过程： 这个人也因为其在计算机科学领域方面所进行的先锋性工作而被世人所熟悉。巴贝奇（Babbage）通过寻找重复的字母段破解了这个密码系统。当然，维热纳尔密码的优势在于这种密码被假定为它将不同位置的字母进行不同的加密。比如同一段文字中的“THE”可能在前面表现为“UPK”，但在后面则被表现为“BNF”。同样，像“AKER”这样的字母也会被进行不同的加密。但是，第一个和第三个“THE”都会被编码为“UPK”。第一个“THE”中的“T”会用“B”来进行编码，而第三个“THE”中的“T”也同样是用“B”来编码。发生这种情况是因为第三个“THE”是排在第一个“THE”后面第二十一个字母，而三字密钥BIG会在重复七次之后又回到了最开始。在任何比密钥要长得多的加密信息中，都会不可避免地出现类似这样的重复。而一个解密者应该如何才能揭示加密文件的真正面目呢？比如，如果加密文字“UPK”出现了两次，中间隔着21个字母，那么他就可以推断出密钥的长度是21的整除数。或者换种说法，他可以推断出21是密钥的倍数。（约数或称除数是一个数字被除之后不会有余数。比如21的除数就是1、3、7和21。）如果获得了足够多类似的线索，解密者就可以知道密钥的确切长度。一旦他知道了密钥长度，他就可以对加密信息进行日常频率分析。注意，数学在解密工作中总是放在首位的：解密者首先会计算出密钥的长度，这步工作甚至是在他要考虑密钥的具体内容是什么之前所要做的。 巴贝奇的独具创意的技巧开创了一片密码术的新天地，并且将数学工具引入到了以前被认为专属于文字学的领域之中。即使一种编密码系统没有明确地使用数学，但其中隐藏的格式却通常需要以数学的方式进行整理。 之后又过了九年，在一八六三年，一位业余数学爱好者、时年五十八岁的普鲁士退役炮兵少校弗里德里希·卡西斯基（Friedrich Kasiski）出版了一本小册子，名字叫《密写和破译的艺术》（Die Geheimschriften und die Dechiffrierkunst）。简单描述一下它的原理：被加密方指定的这个数列，也就是密钥，在实践中不可能是无限长的；在通常情况下，它的长度不仅不会超过明文长度，甚至往往还相当短——在斯维提斯的例子中，密钥“Emily”的长度是五位，也就是说，每加密五个明文字母，就要循环使用“Emily”，对后面的明文字母继续加密。 “循环使用密钥进行加密”——整个多表替代的破绽和死穴，也正在这里。 首先，破译的第一步就是寻找密文中出现超过一次的字母。有两种情况可能导致这样的重复发生。最有可能的是明文中同样的字母序列使用密钥中同样的字母加了密；另外还有一种较小的可能性是明文中两个不同的字母序列通过密钥中不同部分加了密，碰巧都变成了密文中完全一样的序列。假如我们限制在长序列的范围内，那么第二种可能性可以很大程度地被排除，在这种情况下，我们多数考虑到四个字母或四个以上的重复序列。 破译的第二步是确定密钥的长度，先看看这一段： 关键词FORESTFORESTFORESTFOR ESTFOR 明文bettertodowellthantos aywell 密文GSKXWKYCUSOXQZKLSGYCJ EQPJZC 第一个YC出现后到第二个YC的结尾一共有12个字母（USOXQZKLSGYC）， 那么密钥的长度应是12的约数——1，2，3，4，6，12之中的一个（其中，1可排除）。 如下面的密文： ISWZPNQCKMYYYJKAYYEZFFSWEESSPGZXQAHF ISWZPNQCKMTVYJOACVEHAESAZRLTPQIZMXOT QSWMCVUDSIJGGDEUWAZRSFXWILKUEJQLDACB GDLYJXMYLMDQKZMPLDILQEMWFSWDPAZEZQNW DYWDZXFSAEEAZJDUELVPTMCEKWSEEFURZFSW DPXACQAFKMXWAWVEZFSDBGDLAYUQXGDPEKWS EEFURZFSWDPOUEZKZMYLQNPQQDEMJTQYG