Method and apparatus for generating keys for free space optical communication

A free space and optical communication technology, applied in the field of information security, can solve problems such as difficult operation, complicated equipment, and limited transmission distance of the key agreement scheme, and achieve the effects of ensuring consistency, simple operation, and ensuring confidential transmission

Active Publication Date: 2022-05-10
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Due to the high directivity of the laser beam, free-space optical communication is safer than traditional radio frequency communication, but the free-space optical communication channel is open, and eavesdroppers can still eavesdrop without interrupting the beam propagation
[0003] The existing key agreement scheme has limited transmission distance, difficult operation, complex equipment, and cannot guarantee consistency and security

Method used

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  • Method and apparatus for generating keys for free space optical communication
  • Method and apparatus for generating keys for free space optical communication
  • Method and apparatus for generating keys for free space optical communication

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Embodiment Construction

[0024] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0025] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of the present specification shall have ordinary meanings understood by those skilled in the art to which the present disclosure belongs. "First", "second" and similar words used in one or more embodiments of the present specification do not indicate any order, quantity or importance, but are only used to distinguish different components. "Comprising" or "comprising" and similar words mean that the elements or items appearing before the word include the elements or items listed after the word and their equivalents, without excluding other elements or items. Words such as "connected" or "con...

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Abstract

One or more embodiments of this specification provide a method and device for generating a key for free-space optical communication, the method includes: the first communication terminal passes through the first reflective spatial light modulator SLM loaded with a holographic grating, generate the first topological charge l 1 The first orbital angular momentum OAM beam and the second topological charge l 2 The second OAM light beam is transmitted to the second communication terminal in sequence; the second communication terminal randomly selects an operation mode, generates an initial key based on the selected operation mode, and sends the received The first OAM light beam and the second OAM light beam are reflected to the first communication end; the first communication end determines the operation mode selected by the second communication end by monitoring the OAM light beam, and based on the determined The mode of operation generates said initial key. The method and device are simple to operate, do not need to introduce complex equipment, and at the same time ensure consistency, randomness and security, and ensure the confidential transmission of information.

Description

technical field [0001] The present disclosure relates to the technical field of information security, and in particular to a method and device for generating a key for free-space optical communication. Background technique [0002] Free Space Optical (FSO) communication is a communication method that uses laser as an information carrier and transmits through the atmosphere or outer space. It has the advantages of large communication capacity and high-speed transmission. Due to the high directivity of the laser beam, free-space optical communication is safer than traditional radio frequency communication, but the free-space optical communication channel is open, and eavesdroppers can still eavesdrop without interrupting the beam propagation. [0003] The existing key agreement scheme has limited transmission distance, difficult operation, complex equipment, and cannot guarantee consistency and security. Contents of the invention [0004] In view of this, the purpose of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/11H04B10/70H04B10/85H04L9/08
CPCH04B10/11H04B10/70H04B10/85H04L9/0861H04L9/0838H04L9/0852
Inventor 李亚杰张杰祝孔妮雷超赵永利王祥青宋浩鲲
Owner BEIJING UNIV OF POSTS & TELECOMM
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