Cryptography – Cryptanalysis
Patent
1986-02-14
1988-06-07
Cangialosi, Salvatore
Cryptography
Cryptanalysis
380 36, 380 38, 380 48, H04K 100
Patent
active
047502053
ABSTRACT:
The present invention relates to speech scrambling techniques and systems and in particular to a frequency or time domain speech scrambling technique and system which does not require any frame synchronization. This invention is technique and system for scrambling speech signal in frequency or time domain by means of speech analysis-synthesis techniques. The system described above is very attractive because it has avoided the frame synchronization problem. The existing analog telephone channel can be utilized directly for transmission because bandwidth expansion is completely controllable. In addition, the "key space" is very large and a high degree of security can be achieved.
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Chang Ching-Sung
Chou Ger-Chih
Lee Lin-Shan
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