Speech scrambling based on imitation of a target speech signal with non-confidential content
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Tipus de documentArticle
Data publicació2014-05-15
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Abstract
This paper shows a new approach of speech scrambling using imitation
to produce a scrambled speech signal with intelligible content. The secret message imitates a target speech signal with non-confidential content through an adaptation mechanism.Unlike the classical approach, the key is not an input of the system because
it is created in the adaptation process. Several tests are conducted in order to validate
adaptation as an efficient key generator, and the robustness of the scrambled speech
signal against signal manipulation attacks. The advantages of our proposal are (1) the
scrambled speech signal is an intelligible speech signal so that it does not generate
suspicious about the existence of the secret message, (2) the system does not require an
external key generator because the elements are permutated according to the adaptation
process, (3) the length of the key is long enough so that it guarantees that the key is not
found by brute-force attack, and (4) it works with perfect secrecy because the a priori
probability of the secret message is the same as the a posteriori probability, given the
scrambled speech signal.
CitacióBallesteros, D.; Moreno, J. Speech scrambling based on imitation of a target speech signal with non-confidential content. "Circuits systems and signal processing", 15 Maig 2014, vol. 33, núm. 11, p. 3475-3498.
ISSN0278-081X
Versió de l'editorhttp://link.springer.com/article/10.1007%2Fs00034-014-9810-9
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