Chapter 852: I can’t imitate (Today is still 4k, tomorrow’s recovery is three chapters)
Not to mention that the Russians grind chips quickly, even the Gaul chicken is quite slow.
After the arrival of the program-controlled switch, they experienced the similar journey of the Russians, and suddenly realized that they still had to polish the chips, and they had to pick out the lumps or a few lumps from a pile of cow shit. The most important thing is to grind.
Fortunately, this is not very difficult for the Gallics. They have locked in some of the most suspected chips through device location, circuit direction and wiring type.
"merde!"
A Gaul man who was operating and polishing cursed and stopped his work.
The Gauls next to him put their heads over. "Matthew, what happened?"
Matthew pointed his hand at the polishing epoxy: "Look at this, I have some unknown premonition."
He gently wiped the epoxy resin with his hand, and the grinded gray powder surface immediately turned black and clean. On the surface that had been polished, some golden silk threads and The fracture began to appear on it, from the parts that can be seen, it can even be guessed, and it is widely distributed. It can be said that it is everywhere in this piece of epoxy resin.
"What is this?" asked another person.
Matthew pondered: "It should be enameled wire. Why do they have to incorporate this kind of thing into the epoxy resin?"
"To strengthen the structural strength?" This is a barely reasonable thing guess.
Just like reinforced concrete, and even high-strength steel mixtures in which iron nails are mixed in concrete in addition to steel bars, this way of adding wires to the resin should theoretically contribute to strength. "No, no, no..." Matthew kept shaking his head, "For the working environment required for this kind of equipment, the strength of the epoxy resin is completely sufficient and there is no need for any strengthening. And even if you want to strengthen it, there are other means, and you don’t need to use this very troublesome method.”
"What's the reason?" His colleague was also confused. "Oh no! I hope it's not what I thought." Matthew picked up the meter and began to measure the connectivity between the broken wires and the positive electrode of the power input.
"Beep...beep..." The sound of the instrument made Matthew's heart sink to the bottom.
It's clear!
Matthew, who is proficient in circuits, immediately understood that the Orientals buried the power supply wires of the chip in the epoxy resin outside the chip, and surrounded the chip firmly!
In this case, if you want to see the chip, you must cut off these lines, but once these lines are cut off, the consequences are self-evident. You should know that most of them are RAM chips that are easily lost when power is lost. Once power is cut off, It means that the data inside is lost.
His only hope now is that this chip is a decoding circuit, and there is no data inside, but just a solidified decoding logic. In this way, the integrity of the data will not be destroyed.
Thinking of this, he picked up the instrument, adjusted the gears, and began to test the power supply of each chip. Compared with other functional pins, the power supply pins were relatively easy to find. At this time, they had already confirmed these cows. The power supply positive electrode and ground wire of shit tablet.
The test results made his heart fall into an ice cave - almost every chip was powered off, which means that all the programs and data inside were wiped out for the RAM chip that needed to be kept by the battery.
Good news - This piece that was ground open is indeed a decoding circuit.
Bad news - this decoding circuit is almost the beginning of the power bus!
Almost all RAM chips are powered on the power bus behind. The power supply of this chip is cut off, which means that the data of all RAM chips are lost.
"Cunning Oriental!!!" Matthew roared angryly. "Matthew, don't worry, things are not that bad." His colleague hurriedly comforted him.
"Isn't this bad enough?" Matthew was very discouraged.
"Yes, this set is sure to be useless, but at least we can completely disassemble it without any scruples. After clarifying its structure, we will deal with the remaining set, right? Don't forget , What we want is a mapping relationship of out-of-order addressing, which is solidified in the logic circuit chip, and power failure will not be affected. As long as this relationship can be found, we can correctly read the data from another set. It may take a lot of time to come out, but at least it is not hopeless."
Matthew came out of his frustration, and his colleagues made sense, but he always felt that this matter might not be that simple . "I always feel that Orientals may not be as simple as you imagined... at least from the anti-theft methods known before," Matthew muttered.
If they had communication with the Russians, the Russians would answer their questions immediately. Gao Zhendong's technique was indeed not that simple.
Because the Russians received goods earlier than them, the progress was naturally faster than them, and they discovered the desperate facts earlier.
"Suka Bule! Their address mapping circuit is not a logic circuit at all!" Anatoly let out a shocking roar. "What are you talking about?" Vitali asked.
"I polished the address mapping chip in this scrapped memory module. It was a computer! A microcontroller! Their address mapping is not logic at all, but based on the microcontroller based on the out-of-order The program in the microcontroller is processed."
Vitali was a little puzzled: "Isn't this a good thing, my Davari. In this way, you just need to take out the address mapping program and you can Read all the programs and data on another intact machine. "
"Impossible, Vitali, they use microcontrollers! And it's a special microcontroller, from the perspective of structure , there is no external memory, they write the mapping program in the power-down RAM in the microcontroller. After the power-down, even the mapping program will be lost! This structure completely enclosed in the microcontroller makes it impossible for us to obtain the microcontroller Any data and programs! ”
This is what Gao Zhendong thought of. This special microcontroller was produced on the small integrated circuit production line of the third branch factory. It is only one purpose, so that it is impossible to easily obtain any data inside.
This microcontroller does not communicate with the outside world at all except for the functional instructions that need to be executed, and even does not have any other interface except for the necessary functional interfaces, which means that the data inside cannot be transferred to the data inside at all. Read the program.
The use of on-chip power-down RAM instead of program memory further increases the difficulty of reading.
There is nothing left when the power is lost. But the power supply wire of this thing is not broken, so you can't see the microcontroller itself at all. Even if you have the ability to carve on the chip, it is difficult not to destroy it. It is even more difficult to get in touch with the chip itself under the premise of programs and data.
Vitali is also an expert in computer science, and he is not helpless about it. "Then can we solve the power supply problem first, such as using chemical means to dissolve or physical means to remove epoxy resin to ensure the power supply of the chip, and directly read data from the data bus in the chip?"
This is equivalent to wiring on the silicon wafer. Can the power supply problem be solved? Let it be put aside first. Anatoli glanced at him: "Impossible, at least it is impossible for us. Comrade Vitali , the pins on the silicon wafer were made by plating and other means in the early stage of manufacturing, and then they could connect the pins. The internal data bus you mentioned, first of all, we can't find it, we can't find it in 10,000. Find this bus in a thousand transistors. Secondly, find out that you can't connect to the line. In the most optimistic state, we need to face a 10-micron-wide aluminum-plated channel, which doesn't even have this condition."
At this time, another Russian expert raised his head from the instrument: "Impossible, if you turn on the chip, you won't be able to read anything even if you connect the cable."
"Davari, what do you mean?" This is an electronics expert. Although he can't play with integrated circuits, he is better than Vitali and Anatoly, who are engaged in computer science, in any case, in the electronics major, he is better than Vitali and Anatoly, who are engaged in computers. Be strong.
The electronics expert pointed his hand at an instrument on the side. The red LED numbers on the instrument looked very beautiful. The LED digital tube was also imported from the Southern Comrades.
"This is a milliamper meter. At this time, it is testing the current and power consumption of the microcontroller that you mentioned. Although the programs and data inside have been lost, under normal circumstances, it will still It consumes electricity, but you should pay attention."
Vitali and Anatoly, who were confused and confused, looked at the mA meter.
There is a number that is jumping, probably in the range of dozens of milliamperes.
The electronics expert reached out and removed a black opaque plastic sheet from the top of the decoding microcontroller that had been polished, which was equivalent to exposing the silicon wafer of the decoding microcontroller directly to the light.
Anatoli and his two saw a very magical phenomenon at this time. Just after he moved the plastic sheet away, the numbers on the milliampere meter jumped rapidly and changed in a very short time. It has become only about 0.0.
"What does this mean?" asked Vitali, who was deeply troubled.
No mistakes, one poem, one post, one content, one in 6, one book, one bar, one read! "This means that once the silicon wafer is exposed to light, the power supply of the chip will be cut off. This has nothing to do with the external enameled wires, it is the function of the chip itself. ”
Vitali and Anatoly understand very well that with the special structure of this chip, even if the power is only cut off for one second, the data and programs inside will disappear. "How did they do it?" Anatoly felt as if he was dead.
"I guess, it's just a guess. They made photosensitive components directly on silicon wafers in some key places in the integrated circuit and integrated them into the entire circuit. These photosensitive components have only one function, that is, after feeling the light, Cut off the power supply of the chip. "
It is not too troublesome to make the photosensitive element on the silicon wafer, especially after the integrated circuit technology, just consider it well when designing it.
"Then..." Vitali wanted to ask something else.
The electronics expert shook his hand: "I know what you want to ask, but you can't cross it. They can arrange many components in it, anywhere, or even many types. Visible, near-infrared, far-infrared... We have no way to find these photosensitive elements one by one from thousands of transistors and other structures, which means that any part of the chip may lose data when it is illuminated. ”
Vitali did want to step over these photosensitive elements, but at this point, they already understood that it was impossible.
There is more than this bad news. An expert hurried in with a copy of information.
"Comrades, there is bad news."
This was temporarily borrowed. This comrade was in the material aspect, because the imitation team discovered it when disassembling the relay. Some bad situations were not very good, so I temporarily drew him over.
"Tell me..." The Russians present had already become numb. Since they were all bad news, they would not suffer repeated trouble after listening to it at once. "Their relays have a very special material in contacts. To be clear, we don't have one." The material expert raised the information in his hand.
"Is it a precious metal relay? There is such a relay in Citimen's vertical and horizontal switches."
To put it bluntly, it is to use the excellent characteristics of precious metals to achieve miracles and achieve performance that ordinary contact metals cannot achieve.
The things are good, the only problem is that they are expensive, and they are expensive. "No, the material they use is not very expensive, mainly tungsten and silver." "Then you know the ingredients, can't you directly make it? My comrade .” Vitali said.
"It's not as simple as you think, my Davari. Knowing that the ingredients and being able to make exactly the same materials are completely different. The distance between the two is as far away from the Far East to us."
The material experts remembered the imported high-temperature alloys that still leave their colleagues helpless. "For example, my chemical composition is not much different from that of pigs." Thinking of this, the materials expert made a technical joke.
The Russians present all laughed, let's relax, it's already like this anyway.
At least compared to other news, this problem is not even a problem. At most, it is not impossible to use precious metal relays or even old-fashioned relays, although it will cost a lot.
What the Russians want is program-controlled exchange, and they don’t have to have a “small program-controlled exchange”.
"Report to the top. My comrades, Comrades in the Southern switch, there is no possibility of imitating it, at least at this stage. Instead of wasting everyone's energy on this matter, it is better to let it go Let's do something else. For example, test how this machine is like? At least we have one intact."
"You make sense, but in this case, we have to buy at least another one Taiwan can do it." An old Russian communications expert shrugged.
"Why?"
"Because we cannot complete the test between two exchange stations by relying on this intact. This is even the most basic test, and it cannot be done without Finished.”
Looking at the machine that was dismantled, everyone present smiled bitterly.
(This chapter ends)