International audienceThe paper deals with the synchronization of two chaotic Sigma-Delta Modulators. The synchronization is reached via two modulators: one of the modulators is used to code the input information into a bitstream, while the second demodulator is used to decode the obtained bitstream into the original state of the applied input signal. In this way, the system could also be used for chaotic encryption; current work utilize genetic algorithms with which all the states of the original system can be reconstructed with only partial information