CN212660171U - Quantum key distribution system applied to mobile communication network - Google Patents
Quantum key distribution system applied to mobile communication network Download PDFInfo
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- CN212660171U CN212660171U CN202021211000.3U CN202021211000U CN212660171U CN 212660171 U CN212660171 U CN 212660171U CN 202021211000 U CN202021211000 U CN 202021211000U CN 212660171 U CN212660171 U CN 212660171U
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Abstract
The utility model provides a quantum key distribution system applied to a mobile communication network, which comprises a base station, a mobile communication terminal and a remote server; the base station interacts with the mobile communication terminal through a mobile network and interacts with the remote server through an optical fiber; the mobile communication terminal is provided with a true random number generator, the base station is provided with a single photon sending module, and the remote server is provided with a QKD receiving device. The mobile communication terminal and the remote server perform quantum key negotiation based on BB84 protocol through the base station, so that the mobile communication terminal and the remote server obtain the same quantum key, and further realize quantum communication between the two parties. The utility model discloses can realize not installing the quantum communication between mobile communication terminal and the remote server of QKD equipment, improve mobile communication terminal's communication security.
Description
Technical Field
The utility model relates to a quantum communication field especially relates to a be applied to mobile communication network's quantum key distribution system.
Background
With the improvement of computer computing power and the rapid progress of a plurality of computing methods, the traditional public key cryptosystem cannot meet the requirement of communication security, and quantum cryptography comes with the move. The principle of Quantum Key Distribution (QKD) is that both communication parties can generate and share a random and secure key by using quantum mechanical characteristics to encrypt and decrypt transmitted information in the communication process of both parties, and the quantum key has absolute security and indecipherability.
In the prior art, two communication parties generally need to install the QKD devices respectively and then carry out quantum communication according to a quantum key distribution protocol, and the most common protocol is a BB84 protocol, a B92 protocol and an E91 protocol.
However, based on either protocol, quantum communication can be achieved by installing QKD devices on both sides of the communication. However, for some mobile communication terminals with smaller size, such as mobile phones, etc., because the QKD device has larger size and higher price, the QKD device cannot be integrated into such small-sized communication terminals at present, and therefore, the small-sized mobile communication terminal devices such as mobile phones cannot join the quantum privacy network.
How to enable a small mobile communication terminal such as a mobile phone to perform quantum communication with a remote server under the condition that the small mobile communication terminal such as the mobile phone is not integrated with a QKD device is a technical problem to be solved in the field.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the technical problem, the utility model provides a be applied to mobile communication network's quantum key distribution system.
The technical scheme is as follows: the utility model provides a technical scheme does:
a quantum key distribution system applied to a mobile communication network comprises a base station, a mobile communication terminal and a remote server; the base station interacts with the mobile communication terminal through a mobile network and interacts with the remote server through an optical fiber;
the mobile communication terminal is provided with a true random number generator, the base station is provided with a single photon sending module, and the remote server is provided with a QKD receiving device;
the mobile communication terminal generates a first true random number sequence for selecting a photon polarization state through a true random number generator and sends the first true random number sequence to the base station; the base station sends photons in corresponding polarization states through a single photon sending module according to the first true random number sequence; the remote server randomly selects a measurement base through the QKD receiving equipment to measure the received photons to obtain photon polarization state information;
the remote server tells the mobile communication terminal the measurement base sequence through a classical channel, the mobile communication terminal tells the remote server which is the correct measurement base sequence through classical communication, and the remote server and the mobile communication terminal can obtain a first quantum key obtained according to a BB84 protocol after negotiation; and then, randomly comparing some key sequences in the first quantum key between the remote server and the mobile communication terminal, when the error rate is less than a threshold value, continuing bit error correction and privacy amplification by the remote server and the mobile communication terminal, and then obtaining the unconditional safe quantum key between the remote server and the mobile communication terminal.
Further, the single photon sending module is a weak laser pulse generator.
Further, secret communication is carried out between the base station and the mobile communication terminal through a symmetric key mechanism.
Furthermore, a plurality of quantum repeaters are further arranged between the base station and the remote server, and the quantum repeaters are connected in series through optical fibers to form a quantum channel between the base station and the remote server.
Has the advantages that: compared with the prior art, the utility model, following technological effect has:
through the utility model provides a technical scheme, small-size mobile communication terminals such as cell-phone can carry out quantum communication between the remote server of basic station and the integrated QKD equipment of QKD equipment through having integrateed the QKD equipment, has greatly improved the communication security between mobile communication terminals such as cell-phone, and a basic station that has integrated the QKD equipment can provide quantum secret communication network, low cost for a plurality of mobile communication terminals simultaneously.
Drawings
Fig. 1 is a system configuration diagram according to an embodiment.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
Example (b):
fig. 1 shows a quantum key distribution system applied to a mobile communication network, comprising a base station, a mobile communication terminal a and a remote server B; the mobile communication terminal A is provided with a true random number generator, the base station is provided with a single photon sending module, and the remote server B is provided with a QKD receiving device; the base station interacts with a mobile communication terminal A through a mobile network, and simultaneously interacts with a remote server B through an optical fiber, so that quantum communication based on a BB84 protocol is realized.
The flow of the communication method implemented by the system shown in fig. 1 is as follows:
when the mobile communication terminal A needs to carry out secret communication with the remote server B, the mobile communication terminal A and the remote server B carry out corresponding quantum key agreement through the base station, and the specific flow of the key agreement is as follows:
firstly, a mobile communication terminal A generates a first true random number sequence, wherein the first true random number sequence comprises a true random number sequence Sa (bit sequence) and a ma (sending base sequence), and a polarization state sequence x of photons emitted by a single photon emission module can be determined according to the two sequences. Specifically, according to the following rule, when the sa sequence is bit 0 and the ma sequence is also 0, the polarization state is H; when the sa sequence is bit 0 and the ma sequence is 1, the polarization state is +; when the sa sequence is bit 1 and the ma sequence is 0, the polarization state is V; when the sa sequence is bit 1 and the ma sequence is also 1, the polarization states are-, "H, +, V, -" are the four polarization states of the photon.
Then, the mobile communication terminal A sends the generated polarization state sequence x to the base station, the base station obtains the polarization state information of the single photon to be emitted, and then the single photon emission module in the base station sends the single photon in the corresponding polarization state to the QKD receiving equipment of the remote server B.
The QKD receiving device of the remote server B measures the received photons one by one through the random measurement base sequence mb to obtain related polarization state information, and converts the measurement result into a bit sequence according to a certain encoding rule, such as bit 0 corresponding to the horizontal polarization state and the 45-degree polarization state, and bit 1 corresponding to the vertical polarization state and the 135-degree polarization state.
Finally, the remote server B informs the mobile communication terminal A of the measurement base sequence mb through a classical channel, the mobile communication terminal A compares ma with mb, then informs the remote server B of which the measurement base sequence is correct through classical communication, and after negotiation, the two parties can obtain a quantum key K1 obtained according to a BB84 protocol. And then the remote server B and the mobile communication terminal A randomly carry out public comparison on some key sequences, when the error rate is less than a threshold value (for example, 11%), the two parties continue to carry out bit error correction and privacy amplification operation, and finally the two parties obtain the unconditionally safe quantum key K. The quantum key K can be used for realizing safe communication between two parties.
Specifically, in the above scheme, the single photon emission module is a relatively ideal single photon source device, and in reality, a weak laser pulse may be used to replace the single photon module, for example, a laser, an attenuator, a polarizer and a polarization controller may be used to form a realistic single photon module.
Specifically, the base station and the remote server may communicate directly through an optical fiber, or a plurality of quantum repeaters may be disposed between the base station and the remote server, and the plurality of quantum repeaters are connected in series through an optical fiber to form a quantum channel between the base station and the remote server. Through the arrangement of the quantum repeater, the condition that the photon receiving fails due to the overlong optical fiber can be avoided.
In addition, a decoy state idea can be added into the BB84 protocol, the decoy state can overcome photon number separation attack, the method has strong practical significance, the method becomes a mainstream scheme of quantum key distribution at present, and the BB84 scheme based on the decoy state is mostly applied in a real scene. In the above embodiment, a spoofing state may also be added, the single-photon module randomly generates a signal state and a spoofing state according to a certain probability, and both sides negotiating the quantum key may obtain an unconditionally secure quantum key according to the BB84 scheme based on the spoofing state.
As a further optimization of the above embodiment, an encryption method is further set between the mobile communication terminal a and the base station, specifically as follows:
the base station and the remote server B form a quantum key pair by the method for forming the quantum key pair between the mobile communication terminal a and the remote server B, and continuously accumulate the quantum key pair, thereby forming quantum key pools of both parties, and the quantum key pool can update keys by using the same method, thereby ensuring the freshness of the quantum key pool. The mobile communication terminal A is configured with a quantum key fob which is provided with a quantum random number key pool and issued by a remote server B, the remote server B is simultaneously stored with the same key pool, so that the quantum key pools of both sides are formed, and the quantum key pool can perform key updating by using the method for forming the quantum key pair between the mobile communication terminal A and the remote server B, so that the freshness of the quantum key pool is ensured; and the base station and the mobile communication terminal respectively select a group of random number sequences from respective key pools as the symmetric keys of the communication so as to carry out identity authentication and secret communication with the remote server B during each communication. The remote server B issues quantum random numbers as session keys for the two parties in a secret communication mode, and the quantum random numbers serve as encryption keys between the mobile communication terminal A and the base station.
More preferably, the mobile communication terminal a performs quantum key agreement with the remote management center through the base station to generate a new shared quantum key KG according to the inventive concept in the embodiment (the remote management center includes the QKD device, so the mobile communication terminal a can perform QKD key agreement with the remote management center in combination with the base station).
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (4)
1. A quantum key distribution system applied to a mobile communication network is characterized by comprising a base station, a mobile communication terminal and a remote server; the base station interacts with the mobile communication terminal through a mobile network and interacts with the remote server through an optical fiber;
the mobile communication terminal is provided with a true random number generator, the base station is provided with a single photon sending module, and the remote server is provided with a QKD receiving device;
the mobile communication terminal generates a first true random number sequence for selecting a photon polarization state through a true random number generator and sends the first true random number sequence to the base station; the base station sends photons in corresponding polarization states through a single photon sending module according to the first true random number sequence; the remote server randomly selects a measurement base through the QKD receiving equipment to measure the received photons to obtain photon polarization state information;
the remote server performs classical communication in a BB84 protocol with the mobile communication terminal through a classical channel to obtain the quantum key.
2. The quantum key distribution system applied to the mobile communication network of claim 1, wherein the single photon transmission module is a weak laser pulse generator.
3. The quantum key distribution system applied to the mobile communication network of claim 1, wherein the base station and the mobile communication terminal perform secret communication through a symmetric key mechanism.
4. The quantum key distribution system applied to the mobile communication network of claim 1, wherein a plurality of quantum repeaters are further disposed between the base station and the remote server, and are connected in series through an optical fiber to form a quantum channel between the base station and the remote server.
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| CN202021211000.3U CN212660171U (en) | 2020-06-24 | 2020-06-24 | Quantum key distribution system applied to mobile communication network |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115085920A (en) * | 2022-07-15 | 2022-09-20 | 矩阵时光数字科技有限公司 | Key management method, device, equipment, system and medium |
| CN116318689A (en) * | 2023-05-25 | 2023-06-23 | 天津市城市规划设计研究总院有限公司 | Method and system for improving information transmission safety of Internet of things equipment by utilizing quantum key |
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2020
- 2020-06-24 CN CN202021211000.3U patent/CN212660171U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115085920A (en) * | 2022-07-15 | 2022-09-20 | 矩阵时光数字科技有限公司 | Key management method, device, equipment, system and medium |
| CN115085920B (en) * | 2022-07-15 | 2024-01-16 | 矩阵时光数字科技有限公司 | Key management method, device, equipment, system and medium |
| CN116318689A (en) * | 2023-05-25 | 2023-06-23 | 天津市城市规划设计研究总院有限公司 | Method and system for improving information transmission safety of Internet of things equipment by utilizing quantum key |
| CN116318689B (en) * | 2023-05-25 | 2023-07-28 | 天津市城市规划设计研究总院有限公司 | Method and system for improving information transmission safety of Internet of things equipment by utilizing quantum key |
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