Tic-Tac, Forgery Time Has Run-Up! Live Acoustic Watermarking For Integrity Check in Forensic Applications

A common problem in audio forensics is the difficulty to authenticate an audio recording. In this paper we provide a novel and reliable solution to this problem by making use of a control signal, visible and audible on the actual recording, yet ignored by the listener, the TIC-TAC signal. We describe our live watermark solution, we incorporate it in an integrity check algorithm and we provide meaningful preliminary tests. Their results, computed in terms of precision show an outstanding performance: 100% detection rate for edited recordings by means of deletinglinserting audio fragments longer than 5ms and 0% false alarm rate for unedited recordings.