Research On Speech Encryption Based On Silicon Photon Microcavity Chaos And DNA Encoding

With the rapid development of modern communication technology,it is increasingly important to effectively protect the security of multimedia data.Voice data,as an important form of multimedia data,voice data may be maliciously intercepted by criminals when it is transmitted in the network in plain text,which may cause unnecessary losses to individuals and the country.Currently,various encryption algorithms are widely used to ensure the security of multimedia data,including voice.How designing a safe and reliable encryption algorithm has become the key to ensuring the security of voice data transmission.In recent years,with the in-depth study of chaos,the excellent performance of chaotic systems is consistent with the characteristics of traditional cryptography.Many classical chaotic systems have been utilized in various encryption algorithms,Among them,the use of chaotic systems for speech encryption is also gradually become a research hotspot.Silicon photon microcavity chaos,as a type of chaotic system,exhibits excellent characteristics such as highly sensitive initial value and pseudo-randomness,making it an object of attention for many researchers.The thesis applies silicon photon microcavity chaos to speech encryption and combined it with the knowledge of cryptography.The main research of this thesis includes the following:（1）Thesis proposes a speech encryption algorithm based on silicon photon microcavity chaos.The trajectory of silicon photon chaos in the microcavity is simulated by nonlinear equations,and the corresponding silicon photon chaos sequence is simulated.The performance of the chaos is analyzed in detail,and it is proved that the chaos has pseudo-randomness and initial value sensitivity.On this basis,combined with DNA coding technology,a speech encryption algorithm based on silicon photon chaos is designed.In the encryption process,firstly,the speech sequence is scrambled by index scrambling,and the scrambled sequence is XORed with the silicon photon chaotic sequence to achieve the initial diffusion effect.Next,the sequence is DNA encoded,and the coded sequence and the silicon photon chaotic sequence are subjected to DNA computing operations to achieve a good diffusion effect.The key space of the proposed scheme is 2³⁵²,and the evaluation of various indicators of the scheme shows that the scheme has good security.（2）Thesis proposes a dual-channel speech encryption algorithm based on silicon photon microcavity chaos,which utilizes cross-transformation and cyclic displacement techniques.Based on the aforementioned scheme,this scheme is suitable for the encryption of dual-channel audio.First,cross-transformation is applied between the two audio channels to enhance the scrambling effect.Next,this scheme designs a forward and reverse circular displacement operation to enhance the diffusion effect.Similarly,the dual-channel audio is DNA encoded dynamically,for the encoded data,a dynamic DNA calculation between two channels based on silicon photon chaotic sequence is designed.In the encryption process of this scheme,three different groups of silicon photon chaos are used,and they are used in different encryption processes,The key space of the proposed scheme is 2⁵⁸⁴.Various indicators of the scheme were evaluated,with the number of sample change rates（NSCR）and the unified averaged changed intensity（UACI）is 99.9985%and 33.30%,respectively.These values are very close to the ideal values,indicating the excellent encryption effect and security of the scheme.