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A new key generation method for frequency-domain speech scramblers

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2 Author(s)
Woo, R.W. ; Dept. of Electr. Eng., British Columbia Univ., Vancouver, BC, Canada ; Leung, C.

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,

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Communications, IEEE Transactions on  (Volume:45 ,  Issue: 7 )