Watermarking of Unified Multimedia Data Types, Audio and Image

In this paper the audio and image are converted into unified data format. This data is then converted into randomized spectral components using two dimensional discrete fractional random transform. The parameters of encryption scheme are also utilized as a key in watermark embedding process. At the receiver end the data is decrypted, decoded for watermark and then reconverted to their original data formats. This method render no physical modifications in the host signal while embedding the watermark. Use of same randomization technique for encryption and watermarking of two different data types reduces number of computations. Further the signal recovered after decryption and watermark extraction process was found to have least deviation from the host signal.