  We propose a new audio signal encryption scheme based on the chaotic H\'enon
map. The scheme mainly comprises two phases: one is the preprocessing stage
where the audio signal is transformed into a data by the lifting wavelet scheme
and the other in which the transformed data is encrypted by chaotic data set
and hyperbolic functions. Furthermore, we use dynamic keys and consider the key
space size to be large enough to resist any kind of cryptographic attacks. A
statistical investigation is also made to test the security and the efficiency
of the proposed scheme.
