Research On Secure Communication Based On Adaptive Synchronization Of Multistable Chaotic System

In recent years,the rapid development of electronic information technology has led to the growing challenges of information security,and traditional methods of confidential communication have long ceased to meet people’s needs.Chaos is widely utilized in the field of secure communications due to its random-like nature and extreme sensitivity to initial values.Chaotic secure communication,as a new component of secure communication research,has been rapidly developed through the continuous efforts of scholars.In this paper,two chaotic confidential communication schemes based on chaotic masks are constructed using a multistable chaotic system.(1)A multi-level chaotic and confidential communication scheme based on multi-stable chaotic systems is proposed in this paper.Firstly,an adaptive synchronous control technique for a multi-stable chaotic system to achieve synchronous control of transceiver system.Next,the receiver-side chaotic system is manipulated to transition between different attractors,encrypting the plaintext message mask into diverse chaotic sequences by randomly modifying the initial values.Finally,the ciphertext information is decrypted using the synchronized decryption sequence generated by the multistable chaotic system at the receiver’s end.Numerical simulations and sensitivity tests demonstrate that the proposed multi-level chaotic secure communication scheme effectively encrypts and decrypts plaintext signals,exhibiting high security and resistance to noise interference.Furthermore,this chaotic confidential communication scheme employs a dynamic multi-level encryption structure,enhancing its resistance against synchronization attacks.(2)A sub-packet confidential communication scheme based on a multistable chaotic system is proposed in this paper.Firstly,in order to achieve finite time synchronization control between receiver and transmitter,a finite time synchronization controller is designed in this paper.Then,the plaintext message is divided into multiple sub-packets,and then the odd and even packets are sent to the receiver using two sets of drive-response systems with masked encryption,and the two processes are performed alternately.Finally,the decryption process is performed on each packet of ciphertext using synchronized chaotic sequences to obtain the corresponding decrypted information.The combination of all decryption information forms the recovered message.Since each packet of plaintext messages is encrypted into a different chaotic sequence,and the encryption and transmission process of each packet is relatively fast,this encryption scheme provides robust resistance against synchronization attacks.The alternating synchronization structure of the two drive-response systems also improves the efficiency of transmission compared to conventional packetized chaotic confidentiality communication schemes.Specific simulation experiments demonstrate that the proposed scheme effectively achieves encrypted transmission of information.The resulting ciphertext is highly sensitive to initial conditions and system parameters,displaying strong resistance to noise interference.