Perceptual Digest Function for Verifying Integrity in Audio Forensics

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Dora María Ballesteros Diego Renza Héctor Duvan Ortiz


In this work we propose a function that allows to calculate a summary code from the parameters of a voice signal. This function is based on ordering of spectral coefficients obtained by means of the application of the Fast Fourier Transform (FFT), using a locally generated reference function (Gaussian random noise). The proposed method is oriented to the verification of integrity in forensic voice signals. The proposed methodology has a perceptual approach, which implies that the resulting code is maintained, even when modifications are made, particularly those that do not affect the sensitive content of the signal, such as re-quantization processes. 


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BALLESTEROS, Dora María; RENZA, Diego; DUVAN ORTIZ, Héctor. Perceptual Digest Function for Verifying Integrity in Audio Forensics. Ingeniería y Ciencia | ing.cienc., [S.l.], v. 13, n. 25, p. 167-183, may 2017. ISSN 2256-4314. Available at: <>. Date accessed: 22 sep. 2017. doi:
Hash function; perceptual hash; integrity; audio forensics