Abstract
In low-earth-orbit (LEO) satellite-to-ground communication, the size of satellite antennae is limited and the satellite motion trajectory is predictable, which makes the channel state information (CSI) of the satellite-to-ground channel easy to leak and impossible to use to generate a physical layer key. To solve these problems, we propose a key generation method based on multi-satellite cooperation and random perturbation. On the one hand, we use multi-satellite cooperation to form a constellation that services users, in order to increase the equivalent aperture of satellite antennae and reduce the correlation between the legal channel and the wiretap channel. On the other hand, according to the endogenous characteristics of satellite motion, a random perturbation factor is proposed, which reflects the randomness of the actual channel and ensures that the CSI of the legal channel is not leaked due to the predictability of satellite motion trajectory. Simulation results show that the proposed method can effectively reduce the leakage of the legal channel’s CSI, which makes the method of physical layer key generation safe and feasible in the LEO satellite-to-ground communication scene.
Highlights
With the development of wireless communication technology, LEO satellite communication technology has become an important part of global wireless communication [1,2]
This method has the advantages of simple cryptographic calculations and no additional overhead on key management and distribution [10,11], which is suitable for LEO satellite communication systems
This paper mainly studies the physical layer key generation method in LEO satelliteto-ground scenarios
Summary
With the development of wireless communication technology, LEO satellite communication technology has become an important part of global wireless communication [1,2]. Traditional Cryptography: Traditional cryptography generates secret keys through a cryptographic algorithm, and distributes them to legitimate users to encrypt the plaintext This method uses the computational complexity of cryptographic algorithms to ensure the security of cipher text. Key management and distribution rely on complex protocol architecture It is not suitable for LEO satellite communication systems with limited computing resources, rapid changes in network topology, and massive access to users. Physical Layer Security (PLS): Physical layer security uses the endogenous characteristics of the wireless channel, such as time varying, randomness and uniqueness, to directly extract the secret key This method has the advantages of simple cryptographic calculations and no additional overhead on key management and distribution [10,11], which is suitable for LEO satellite communication systems. This paper proposed the closed expressions of confidential capacity probability, confidential interruption probability and average confidentiality probability
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