Description: GSM-based low bit rate voice covert communication methods. This paper describes a low bit rate can be all the way to 2.4kb/s Mixed Excitation Linear Prediction (MELP) encoded voice information, hidden in another way 13kb/s of GSM encoded voice, through the public channel covert communication methods. The paper gives a new data embedding method to a unit based on the augmented matrix can be (2L+1) bits of information can be modified to embed 2L bits of data information, and a maximum of £ modify the host bits of information , a high data embedding rate, low complexity algorithm, hardware implementation easier, and the impact of information on the host less.
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GSM voice cipher.doc
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