Echo data hiding is a watermarking method used to hide data in an audio file. The echo data hiding is used to provide proof of ownership, annotation, and assurance of content integrity. This method can be applied due to human auditory system weakness which has limitation in capturing sounds. Echo data hiding uses noise to introduce the data in an audio file. Echo data hiding seeks to embed its data into data stream with minimal degradation of the original data. This minimal degradation is intended to make the canges in the cover audio either imperceivable or simply dismissed by the listener as a common non-objectionable environmental distortion. The particular distortion is similar to resonances found in a room due to the existence of walls, furniture, etc. By adjusting several parameters of the echoes, control can be done over both the degree and type of resonance being introduced. With carefully-selected parameter choices, the system discriminatory ability can be used to hide data in an audio data stream. Keywords: Echo Data Hiding, Cepstrum, Autocorrelation