發(fā)布時間：2018-07-21 09:54

【摘要】：為使音頻信息可以在信道中安全傳輸,提出了一種在MPEG壓縮的背景下基于混沌和小波變換的音頻加密算法。首先對信號采用隨機矩陣進行擴充來改變原信號的幅值,其次在"時域-小波域-時域"利用Logistic混沌映射進行3次音頻信號置亂和擴散加密操作,最終得到加密信號。通過分段Logistic映射生成密鑰的隨機矩陣。理論分析發(fā)現(xiàn),所提算法的密鑰空間明顯增大。實驗結(jié)果表明,得到的音頻加密信號的直方圖分布更均勻,信號間的相關(guān)度變小,密鑰敏感度增強。因此,提出的音頻加密算法具有較高的安全性。
[Abstract]:In order to make audio information transmit safely in the channel, an audio encryption algorithm based on chaos and wavelet transform in the background of MPEG compression is proposed. First, the signal is extended to change the amplitude of the original signal by using random matrix. Secondly, 3 audio signal scrambling is made by using Logistic chaotic map in the time domain - wavelet domain - time domain. And the encrypted operation, the encryption signal is finally obtained. The random matrix of the key is generated by the piecewise Logistic mapping. The theoretical analysis shows that the key space of the proposed algorithm is obviously increased. The experimental results show that the histogram distribution of the audio encryption signal is more uniform, the correlation between the signals is smaller and the key sensitivity is enhanced. Therefore, the key sensitivity is enhanced. Therefore, the proposed key sensitivity is enhanced. The audio encryption algorithm has high security.
【作者單位】： 西安郵電大學通信與信息工程學院;
【基金】：國家自然科學基金資助項目(61671377,61472472) 陜西省自然科學基礎(chǔ)研究計劃資助項目(2015JQ6262) 陜西省教育廳專項科研計劃資助項目(15JK1669)資助
【分類號】：TN918.4

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