The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
Copyrights notice
The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Memandangkan sistem penyulitan pertuturan berasaskan FFT mengekalkan kebolehfahaman sisa yang agak besar, seperti pecutan bercakap dan intonasi asal dalam pertuturan yang disulitkan, ini memudahkan penyadap untuk menyimpulkan kandungan maklumat daripada pertuturan yang disulitkan. Dalam surat ini, kami mencadangkan teknik baharu berdasarkan gabungan skema pemultipleksan bahagian frekuensi ortogon (OFDM) dan kaedah pemetaan QAM yang sesuai untuk mengalih keluar kebolehfahaman sisa daripada pertuturan yang disulitkan dengan mengubah suai beberapa komponen frekuensi. Di samping itu, sistem penyulitan pertuturan berasaskan OFDM yang dicadangkan hanya memerlukan dua operasi FFT dan bukannya empat yang diperlukan oleh sistem penyulitan pertuturan berasaskan FFT. Hasil simulasi dibentangkan untuk menunjukkan keberkesanan teknik yang dicadangkan ini.
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Salinan
Der-Chang TSENG, Jung-Hui CHIU, "An OFDM-Based Speech Encryption System without Residual Intelligibility" in IEICE TRANSACTIONS on Information,
vol. E91-D, no. 11, pp. 2742-2745, November 2008, doi: 10.1093/ietisy/e91-d.11.2742.
Abstract: Since an FFT-based speech encryption system retains a considerable residual intelligibility, such as talk spurts and the original intonation in the encrypted speech, this makes it easy for eavesdroppers to deduce the information contents from the encrypted speech. In this letter, we propose a new technique based on the combination of an orthogonal frequency division multiplexing (OFDM) scheme and an appropriate QAM mapping method to remove the residual intelligibility from the encrypted speech by permuting several frequency components. In addition, the proposed OFDM-based speech encryption system needs only two FFT operations instead of the four required by the FFT-based speech encryption system. Simulation results are presented to show the effectiveness of this proposed technique.
URL: https://global.ieice.org/en_transactions/information/10.1093/ietisy/e91-d.11.2742/_p
Salinan
@ARTICLE{e91-d_11_2742,
author={Der-Chang TSENG, Jung-Hui CHIU, },
journal={IEICE TRANSACTIONS on Information},
title={An OFDM-Based Speech Encryption System without Residual Intelligibility},
year={2008},
volume={E91-D},
number={11},
pages={2742-2745},
abstract={Since an FFT-based speech encryption system retains a considerable residual intelligibility, such as talk spurts and the original intonation in the encrypted speech, this makes it easy for eavesdroppers to deduce the information contents from the encrypted speech. In this letter, we propose a new technique based on the combination of an orthogonal frequency division multiplexing (OFDM) scheme and an appropriate QAM mapping method to remove the residual intelligibility from the encrypted speech by permuting several frequency components. In addition, the proposed OFDM-based speech encryption system needs only two FFT operations instead of the four required by the FFT-based speech encryption system. Simulation results are presented to show the effectiveness of this proposed technique.},
keywords={},
doi={10.1093/ietisy/e91-d.11.2742},
ISSN={1745-1361},
month={November},}
Salinan
TY - JOUR
TI - An OFDM-Based Speech Encryption System without Residual Intelligibility
T2 - IEICE TRANSACTIONS on Information
SP - 2742
EP - 2745
AU - Der-Chang TSENG
AU - Jung-Hui CHIU
PY - 2008
DO - 10.1093/ietisy/e91-d.11.2742
JO - IEICE TRANSACTIONS on Information
SN - 1745-1361
VL - E91-D
IS - 11
JA - IEICE TRANSACTIONS on Information
Y1 - November 2008
AB - Since an FFT-based speech encryption system retains a considerable residual intelligibility, such as talk spurts and the original intonation in the encrypted speech, this makes it easy for eavesdroppers to deduce the information contents from the encrypted speech. In this letter, we propose a new technique based on the combination of an orthogonal frequency division multiplexing (OFDM) scheme and an appropriate QAM mapping method to remove the residual intelligibility from the encrypted speech by permuting several frequency components. In addition, the proposed OFDM-based speech encryption system needs only two FFT operations instead of the four required by the FFT-based speech encryption system. Simulation results are presented to show the effectiveness of this proposed technique.
ER -