Chapter 1191: Big hand delivers parcel, small hand delivers key

After coming out of the laboratory, Lu Zhou motioned for Academician Xue to wait for a while, then looked at the two security personnel standing at the door, and instructed in a serious tone.
"Adjust the level of privacy here to Class A. No one should be near here unless it is me."
The two security guards stood upright, raised their hands neatly and performed a military salute.
"Yes."
After leaving the Semiconductor Research Institute, Academician Xue looked at Lu Zhou who was walking nearby and asked.
"They are from the army?"
Lu Zhou: "After being retired and transferred to the industry, I have a good relationship with the head of the team, so I will help arrange the work."
When he comes out of the army, at least he does not need to worry about political trials, and those who do not pass the political trials will not recommend it to him. Moreover, in terms of security capabilities, people coming out of the army are far stronger than those recruited by ordinary means, and even basic training can be omitted, and they can be employed directly.
Ever since the establishment of the Jinling Institute of Higher Education, let alone a criminal case such as material theft, even a draft paper has not been lost, and it is these lovely and dedicated people who have relied on them.
When he brought Academician Xue to the office, Lu Zhou ordered his secretary to pour him a cup of tea and help himself to pour a cup of coffee.
After doing all these things, the secretary left the office with interest and took the door.
Looking at the door closed, Lu Zhou continued to look at the old gentleman sitting opposite him, and said with a smile.
"I guess you have a lot of things to ask, please ask first."
Academician Xue was silent for a while and sighed softly.
"Before I came here, I did have a lot of confusion, but now ... I feel like I've got the answer. Not to mention ..."
The smile of the old academician was a little complicated.
"... Cryptography, it's time to exit the stage of history."
Lu Zhou shook his head.
"This statement is too absolute. It takes time to upgrade any technology. Just as if it has a clean and efficient energy source such as fusion energy, coal power still occupies this small part of the market share in our western region ... "
"What's more, it's the application of encryption algorithms in long-distance communication that is withdrawing from the stage of history. In the short-distance communication from base stations to individuals, and other fields, cryptography can still play a significant role ...
After a pause, Lu Zhou looked at Academician Xue and continued.
"... and just need to make some adjustments."
Repeatedly chewing the words of the landing boat, Academician Xue was lost in thought.
Without disturbing his thinking, Lu Zhou picked up the coffee cup, blew the white mist, and took a sip slowly.
After about five minutes, Academician Xue finally raised his head and said seriously.
"Is there anything I can help you with?"
Lu Zhou's face smiled with approval.
"of course."
"I have a few questions and need to consult an expert in the relevant field."
Academician Xue: "Where?"
"About quantum communications."
After hearing this sentence, Academician Xue froze slightly, with a slightly embarrassed expression: "Quantum communication ... I am not an expert in this field, you should find a professor from HKUST ..."
"Early before you came here, I had sent an email to the professors of the University of Science and Technology, and after hearing my question, they recommended you to me."
Looking at Academician Xue, Lu Zhou continued, "In addition to cryptography, you are also an expert in the field of communication engineering. You were a senior engineer at China Electronics 46 and participated in the construction of early domestic optical fiber networks."
After hearing these memorable events, Academician Xue had a few memories floating in his eyes.
But in the end, he shook his head.
"It's all about old age. I basically switched to the direction of communication security from 10 years ago. I'm afraid it's hard to help you."
"But I believe that experience is not out of date," Lu Zhou said seriously, "especially when we need to re-establish this communication network."
The moment he heard this sentence, Academician Xue was shocked and looked at Lu Zhou in disbelief.
"Do you mean, what do you plan to use ... what kind of ... quantum fiber? Are you going to re-establish a domestic communications network?"
"This is not my intention."
Looking at Academician Xue who had begun to speak incoherently, Lu Zhou smiled slightly, and continued to say in a joking tone.
"Moreover, I didn't say it was only domestic."
...
Once the problem of the quantum repeater is solved, the entire quantum communication technology has the possibility of commercialization.
However, quantum communication technology has a very fatal drawback, that is, the amount of data transmitted in a unit of time.
Take the submarine optical cable from the west coast of the United States to the east coast of China as an example. The bandwidth is always tbs.
Data of this scale is not difficult for traditional optical fibers, but for quantum communication technologies that rely on single-photon entangled pairs to achieve information transfer, this is a problem that cannot be solved in the short term.
In short, the communication channel based on quantum communication technology is not a problem to meet the data exchange between a limited number of enterprises, but it cannot carry the communication of this scale of the Internet at all.
However, this is not without solutions.
According to the istf5 report, a 128-bit key can guarantee 100gbit data security. In theory, only a quantum communication channel with a bandwidth of the order of ts is needed, which is enough to add a lock to all information across the Pacific Ocean.
Therefore, a perfect solution is to combine traditional communication means and quantum communication technology, send "locked" information using traditional communication channels, and then use quantum communication channels to distribute "unlocked" keys.
The abstract description is that the big hand delivers the parcel, and the small hand delivers the key.
This kind of encryption method, which is similar to "one-time-one-density", can theoretically reach the "unconditional security" level. If there is only one unique key to unlock, no matter how fast the computer is, it is impossible to steal the key with pure computing power.
In order to separate the key from the encrypted information, a new set of communication protocols is needed to achieve it. Not only that, in order to improve the efficiency of information transmission, the quantum communication network used to distribute keys must be carefully designed.
It must be acknowledged that this is not an easy task.
However, compared to quantum repeaters, it is still much easier.
With almost no hesitation, Academician Xue accepted Lu Zhou's invitation on the spot, participated in the project of building a quantum communication network, and stayed here at Jinling University in the name of visits and exchanges ~ EbookFREE.me ~ just right, he is still Worry about how to avoid the colleagues and old friends who were waiting for him to go to the Ministry of Industry and Information Technology to "speak out".
Although it is easy to control the mouth, but the industry circle he works in is really too small.
Even if he didn't say a lot of things, one eye would guess everything else.
Whether it's for the big picture or for himself, leaving for a while is the best choice ...
With the addition of Academician Xue, the speed of the entire quantum communication network project can be described with great speed. Based on the experience of the old gentleman, Lu Zhou quickly found the optimal method of combining quantum communication technology with traditional communication technology, and completed a structural framework for this new communication protocol.
In this way, time passed day by day, finally to the last day of April.
An experimental quantum communication pipeline with a length of about 500 meters was built in a hidden corner of the Jinling Institute of Advanced Research. At the same time, this ivory tower standing on the top of the academic circle in China also ushered in a special guest ...