On the joint audio fingerprinting and decryption scheme

Some joint fingerprinting and decryption (JFD) schemes are recently reported. However, most of them need to be investigated before practical applications. In this paper, the audio JFD scheme proposed by Lemma et al. is investigated and evaluated. Some flaws are found in the scheme, such as the low encryption strength, the data overflow caused by encryption and the fragileness to collusion attacks. To improve the scheme, some means are proposed, such as the audio encryption without overflow and the collusion-resistant fingerprint encoding. Comparative experiments show that better performances are obtained by the improved means. The analysis method proposed in this paper can be used to investigate some other JFD schemes.