Implementasi Teknik Watermarking menggunakan FFT dan Spread Spectrum Watermark pada Data Audio Digital

The use of technology and internet has grown rapidly that causes a lot of forgery and illegal proliferation of digital data. It needs a technology that can protect the copyright of multimedia data such as audio. The most common technique in copyright protection is watermarking because it has three main criteria in data security: robustness, imperceptibility, and safety. This research created a scheme that can protect a copyright of audio data. The method that we used is Fast Fourier Transform. This method changes the original audio data into frequency domain before the embedding and extraction process. The watermark is spread into the most significant component of the magnitude spectrum of audio host. This technique obtains Signal-to-Noise Ratio above 20 dB and Bit Error Rate below 5%.