Fan Keqin said: "This encrypted message is from Okubo Takayun. He ordered Yamaguchi Yoshimune to send it only when he retreated. What is this for? Now we can say that we have arrested all the people related to this case. No one can compare with this The encrypted information is related, that is to say, there is another person we don't know, or a group of people in the local area. After all, the platform he wants to send this message is our local People's Daily in Chongqing. If you want to see this from other places, It is not impossible to get a newspaper, but it can only be done by asking someone to deliver it, or asking locals to mail it, etc., which will be delayed a lot. Therefore, there is a high probability that this encrypted information is connected to someone lurking in Chongqing. Japanese spy."
After hearing this, Han Qiang said: "This analysis is reasonable. And publishing it in a newspaper is much safer than using the radio to contact us, because as long as we use the radio, we have a high probability of catching it. The Japanese spies don't know whether we can now Decipher their communications. But newspapers are different. Who knows who the message is used to contact. It’s just...not as timely as radio.”
"Timeliness." Qian Jinxun listened, nodded, and said: "Old Han's words reminded me that he is a single-line spy. Apart from hiding in the Sun God Restaurant for a period of time, when will he complete the mission? He himself doesn’t know, let alone when to retreat. In other words, the information given to him by Okubo Takayun will be sent whenever he retreats. Does this mean that this information is the follow-up to the launch of this plan? ?”
Fan Keqin thought for a while and said: "Well, I agree. Okubo Takayun didn't tell him to send it when he arrived in Chongqing, but when he evacuated. So this information is really likely to be a follow-up plan. The most important thing is, As long as you let him send it, it must be related to this mission."
After he finished speaking, the three of them were silent for a moment. Qian Jinxun said: "What if this kid completes his mission? How can it be related to this confidential information?"
Han Qiang said: "For example, he...I mean for example, for example, this kid knew about the appointment, or the residence of Chief Yan, completed the task, sent this message back to the headquarters using the radio, and then immediately retreated, and at the same time sent this message What effect will the encrypted information have if it is published in the People's Daily? Why can't I understand it?"
Fan Keqin took a puff of cigarette, put out the remaining cigarette butts in the ashtray, and said: "There are too many possibilities, but no matter what, it must be visible."
Qian Jinxun said: "I agree with your previous statement that it is for local people to see. Then after reading it... what does it mean?"
Fan Keqin said: "Activate him? Old Han, can you estimate how many words this message contains?"
Han Qiang said: "Not much. I know there is a way to set it up in advance. For example, a plus sign represents a team of people. But that's it at most, because a symbol cannot represent double meanings or too many words. , otherwise even the person who wrote the password may not be able to recognize it, so I feel that this piece of information is only... twenty digits at most, or even less!"
Fan Keqin said in a deep voice: "Twenty characters, not even... Well, people who read this message must know this set of passwords, so since it is such a short character, it should not be something as routine as agreeing on a meeting place. Information, otherwise it is too rigid, which is not conducive to security. Moreover, the person who wrote this kind of password cannot use it on a large scale. Once it is used too much and too widely, it will be known to us. This is indeed our first This is the first time I encountered this set of passwords, which can be considered as evidence. Then not many people use it... You should get something if you directly search Okubo Takayun. It will not take too long to learn this set of symbolic passwords. Who can follow him? The contact time is longer? It is best to have a name or image information. As long as this name and image appear locally, then whoever is receiving this information must be the spy."
Han Qiang was startled, patted Fan Keqin, and said: "You are really awesome. I never thought of this method in my wildest dreams. But... is it feasible to operate it?" As he said that, he looked at Qian Jinxun.
Qian Jinxun frowned and said: "It is feasible. Isn't Okubo Takayun in Shanghai? We do have spies there. I can also ask them to investigate, but their risks will be greatly increased. I just don't know, risk The risk of exposure and the results are not worth it.”
Fan Keqin said extremely decisively: "Any spy is our biggest bargaining chip and cannot be moved lightly. We have now caught this kid, which means that this plan has been destroyed by us. Yamaguchi Yoshimune has not completed the task for a long time , Okubo Takayun will definitely know that something happened to him, and if our spy is too active at this time, the risk of exposure will be too high in terms of time. It is simply not worth the loss. Let’s do this for now. I will think of a way to see. Let’s see if we can find something else…” He was just saying this when he suddenly stopped.
Qian Jinxun and Han Qiang saw Fan Keqin, staring at the notebook in trance. Qian Jinxun and Han Qiang didn't dare to disturb him for a while. After a while, Fan Keqin came back to his senses, and Qian Jinxun asked quickly: "What did you think of?"
Fan Keqin looked at Han Qiang and said, "We don't have a monitoring device now, but can you locate the radio station?"
Han Qiang stuttered and replied directly: "Theoretically it is possible, but in practice it is very difficult. Because all spy radio stations that appear will try their best to reduce the content to the shortest possible length and strive to send it as quickly as possible. At this time I The monitoring team even just heard the signal. Therefore, a roughly vague direction is okay, such as the urban area, but the urban area is so big, it is the same as not saying anything. Unless he sends endless reports, then I will forget it. You can use the stupidest method to find him regardless of the intensity of the detection frequency, and slowly wander around the city. But how could this happen to little Japanese spies? Unless they are all fools."
At this point, he paused and then said: "I guess you are talking about lateral positioning, right? I do know this method, but it is just using a radio, after all, it is not as good as professional surveillance equipment. The results obtained It’s still very vague.”
After hearing this, Fan Keqin frowned and said: "That still doesn't seem to work." He then explained: "I want to change this encrypted message with some symbols before Okubo Takayun discovers that something happened to Yamaguchi Yoshimune. Get out. In this case, what will people who see the People's Daily think? He will definitely be unsure and think he made a mistake..."
