Title :
A new key generation method for frequency-domain speech scramblers
Author :
Woo, Raymond W. ; Leung, Cyril
Author_Institution :
Dept. of Electr. Eng., British Columbia Univ., Vancouver, BC, Canada
fDate :
7/1/1997 12:00:00 AM
Abstract :
This paper describes a method which uses “derangement” permutations as scrambling keys in a frequency-domain speech scrambling system. Subjective tests based on the number test confirm that such keys produce scrambled speech with virtually no residual intelligibility. A new derangement generation algorithm is introduced for key generation. This algorithm maps each integer g, in the range of 0⩽g<(n-1)!, to a distinct derangement of 2 elements,
Keywords :
cryptography; frequency-domain analysis; speech coding; speech intelligibility; speech processing; algorithm; derangement generation algorithm; derangement permutations; frequency-domain speech scramblers; frequency-domain speech scrambling system; key generation method; number test; residual intelligibility; scrambled speech; scrambling keys; subjective tests; Algorithm design and analysis; Codes; Communications Society; Frequency; Hamming distance; High definition video; Security; Signal processing; Speech analysis; Testing;
Journal_Title :
Communications, IEEE Transactions on
