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Fig. 1. block diagram of the introduced cryptosystem 4. The performance measurements

Figure 1 block diagram of the introduced cryptosystem 4. The performance measurements

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Table 1. Residual intelligibility results for the encryption process 5.3. Effect of Noise
Table 1. Residual intelligibility results for the encryption process 5.3. Effect of Noise
Fig. 2. Waveforms of the (a) acquired; (b) encrypted; (c) decrypted speech signals decryption quality measures used in the current cryptosystem are the same that used in the encryption process which are: Signal to Noise Ratio (SNR), Segmental signal to Noise-Ratio (SNRseg) and Log-Likelihood Ratio (LLR). Higher quality of the decrypted speech signal is obtained when the values of SNR and SNRseg are increased while the value of LLR is decreased. The results of the presented method are given in Table 2. It is clear in this table that the SNR and SNRseg values are high while the LLR value is low which indicates high residual intelligibility. This means that the decryption quality introduced by the proposed method is high.
Fig. 2. Waveforms of the (a) acquired; (b) encrypted; (c) decrypted speech signals decryption quality measures used in the current cryptosystem are the same that used in the encryption process which are: Signal to Noise Ratio (SNR), Segmental signal to Noise-Ratio (SNRseg) and Log-Likelihood Ratio (LLR). Higher quality of the decrypted speech signal is obtained when the values of SNR and SNRseg are increased while the value of LLR is decreased. The results of the presented method are given in Table 2. It is clear in this table that the SNR and SNRseg values are high while the LLR value is low which indicates high residual intelligibility. This means that the decryption quality introduced by the proposed method is high.
Table 2. Residual intelligibility results for the decryption process
Table 2. Residual intelligibility results for the decryption process
Table 3. Quality measures results for decrypted speech signal at different SNR values of noise 6. Comparison of the presented system with current methods
Table 3. Quality measures results for decrypted speech signal at different SNR values of noise 6. Comparison of the presented system with current methods
Comparison of the suggested technique with current methods is made so as to measure the system security in the case of encryption and decryption in terms of the performance measurements which are SNR, SNRseg and LLR. This comparison for the first test speech signal (Signal 1) in encryption case is represented in Table 4. The values of SNR and SNRseg obtained by the introduced method compared to existing methods are high negative which implies that the noise power is much greater than the speech signal power. This means that the detecting of the suggested cryptosystem is very hard while larger value of LLR in this scheme indicates better quality for encryption operation. The comparison of the performance measurements in the case of decryption is reported in Table 5. The values of SNR and SNRseg gained by the presented approach are extremely larger while the value of LLR is extremely lower as compared to other schemes which manifest better quality of decryption. This reveals that in the most of quality criteria, the suggested speech cryptosystem outperforms other current techniques.
Comparison of the suggested technique with current methods is made so as to measure the system security in the case of encryption and decryption in terms of the performance measurements which are SNR, SNRseg and LLR. This comparison for the first test speech signal (Signal 1) in encryption case is represented in Table 4. The values of SNR and SNRseg obtained by the introduced method compared to existing methods are high negative which implies that the noise power is much greater than the speech signal power. This means that the detecting of the suggested cryptosystem is very hard while larger value of LLR in this scheme indicates better quality for encryption operation. The comparison of the performance measurements in the case of decryption is reported in Table 5. The values of SNR and SNRseg gained by the presented approach are extremely larger while the value of LLR is extremely lower as compared to other schemes which manifest better quality of decryption. This reveals that in the most of quality criteria, the suggested speech cryptosystem outperforms other current techniques.
Fig. 3. Quality measures under noise effect of (a) SNR; (b) SNRseg; (c) LLR vs. SNR of noise
Fig. 3. Quality measures under noise effect of (a) SNR; (b) SNRseg; (c) LLR vs. SNR of noise
Table 5. Comparison with other methods in terms of performance measurements in the decryption process
Table 5. Comparison with other methods in terms of performance measurements in the decryption process
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