In this paper a brief review of various audio and image watermarking techniques has been carried out. Properties of both image and audio are different while processing. In this work a blind frequency masking algorithm for hiding the image data into audio signal using DCT is proposed. DCT provides compression & to avoid distortions from DCT compression, additional password key would be used to encrypt data in frequency domain. The secret key or a password would be required to extract a data, also helps to make the data immune from "noise" effects represented by the addition the host signal in the embedder. In a blind watermark detector, the un-watermarked host signal is unknown, and cannot be removed before a watermark extraction. Under these conditions.
DCT, Watermarking, Image to Audio watermarking, Password security
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