Encrypting by random rotations
Proceedings of the 1982 conference on Cryptography
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Selecting permutations for speech scrambling with t.d.m. means to define a suitable weight-function or metric on Sn (the full symmetric group). This can be done in a lot of different ways. We study some of that weight-functions and point out which one should be preferred. An algorithm is given to generate permutations with a prescribed weight. Some hints are given how to compute approximately the distribution function of some weight-functions. Finally rank correlation methods are recommended for testing a t.d.m.- system.