Communication key generation method and secure channel selection method for cognitive radio system

Abstract

The invention discloses a communication key generation method and a secure channel selection method for a cognitive radio system, and belongs to the field of secure communication and information security in radio communication. A common available channel set is established according to a local spectrum pool of received and transmitted nodes, the quantity of channels of the channel set is at least equal to one, beacon signals with random initial phases are received and transmitted multiple times by the aid of channels which are sequentially selected from the available channel set, and phases of the received signals are detected and utilized for generating a random key element matrix according to reciprocity of wireless transmission characteristics of the same channels within a coherent time and differentiation of wireless transmission characteristics of different channels, and finally communication keys are acquired by fusion processing of the matrix. The communication keys are used for encrypting transmitted information and are also used as random seeds for selecting secure communication channels. The communication key generation method and the secure channel selection method have the advantages that interaction of the communication keys among the received and transmitted nodes through the channels is omitted, hidden dangers such as wiretapping, tampering and saturation attack from attackers can be eliminated, and commutation security of the cognitive radio system can be guaranteed.

Description

technical field [0001] The present invention relates to the fields of secure communication and information security in the field of wireless communication, specifically, a method for generating a communication key and a method for selecting a secure channel based on channel physical characteristics when a cognitive radio system performs secure communication. Background technique [0002] Cognitive radio can alleviate the contradiction between spectrum demand and resource constraints, and has a good application prospect. In addition to traditional wireless communication security threats such as control channel saturation attacks, channel eavesdropping, and fixed-frequency interference, cognitive radio systems also have their own unique security risks, such as imitating primary user attacks, attacking spectrum managers, channel negotiation blocking, etc. . [0003] A common method to solve communication security is to design a security strategy for a wireless communication sy...

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Problems solved by technology

Using the reciprocity and difference of the physical transmission characteristics of the wireless channel, it can be used to obtain the incentive source for the generation of the communication key. There is no need to perform communication key interaction, which can eliminate security risks such as communication key theft, fixed-frequency interference, and saturation attacks. However, the communication key generated based on RSS is not very random; in order to enhance the randomness of key generation, the encryption The key generation rate can also be used to generate communication keys using Received Signal Phase (RSP) information, but using fixed channels to perform communication key generation is not suitable for time-varying application scenarios of available channel resources in cognitive radio systems

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