Robust hiding of fingerprint-biometric data into audio signals

This paper presents a novel fingerprint-biometric template protection scheme, in which templates are concealed into audio signals. Fingerprint templates are encrypted by chaotic encryption and then hid into the chaotically selected random sampling points of the host audio signal by a new non-uniform discrete Fourier transform (NDFT)-based data hiding method. The template extraction process is completely blind and does not require original audio signal, thus the extraction depends on the secret key. Experimental results show that the proposed scheme is robust against common signal processing attacks and achieves higher verification accuracy.