基于G.729語(yǔ)音編碼非零脈沖位置信息的隱藏算法
doi: 10.11999/JEIT170879
基金項(xiàng)目:
國(guó)家自然基金委員會(huì)與中國(guó)民航局聯(lián)合基金(U1533107)，天津市自然科學(xué)基金重點(diǎn)項(xiàng)目(17JCZDJC30900)
An Hiding Algorithm of Nonzero Pulses Position Information Based on G.729 Speech Coding
Funds:
The National Natural Science Foundation of China and the China Civil Aviation Authority Joint Fund Project (U1533107), The Key Project of Tianjin Natural Science Foundation (17JCZDJC30900)
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摘要: VoIP以語(yǔ)音流為傳輸媒介，具有傳輸數(shù)據(jù)量大和應(yīng)用廣泛的優(yōu)點(diǎn)。但VoIP系統(tǒng)也面臨數(shù)據(jù)安全和隱私泄露的安全威脅。針對(duì)編碼標(biāo)準(zhǔn)G.729固定碼本搜索的非遍歷特性和具有一定冗余性的特點(diǎn)，該文提出基于G.729語(yǔ)音編碼非零脈沖位置信息的隱藏算法。該算法在固定碼本搜索過程中，利用秘密信息控制碼本的搜索過程，并在非零脈沖位置和秘密信息之間構(gòu)建函數(shù)進(jìn)行信息隱藏。在搜索過程中利用最不重要脈沖替換思想并采用最小化失真準(zhǔn)則控制由秘密信息的嵌入帶來的音質(zhì)失真。實(shí)驗(yàn)結(jié)果表明：算法隱藏容量可達(dá)400 bit/s，算法具有良好的隱蔽性(PESQ平均值約為3.45)。Abstract: VoIP (Voice over Internet Protocol) is based on voice stream, which has the advantages of large data transmission and wide application. But the VoIP system is confronted with the security threats of data security and privacy disclosure. Thus, according to nonergodicity and redundancy of the fixed codebook search, an information hiding algorithm based on fixed codebook search process is proposed. This information hiding algorithm is carried out by a functional relationship between the nonzero pulse positions and secret information. The idea of least significant pulse replacement is used in the search process and a distortion minimization criterion is proposed to control the distortion of speech quality caused by the embedding of secret information. The experimental results show that the hiding capacity of the proposed algorithm is up to 400 bit/s and the average PESQ score is 3.45 which indicate that the algorithm has good imperceptibility.
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Key words:
- Information hiding /
- G.729 /
- Fixed codebook /
- Nonzero pulse positions
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