Frequency-selective partial encryption of compressed audio

Author

Servetti, Antonio ; Testa, Cristiano ; De Martin, Juan Carlos

Author_Institution

Dipt. di Automatica e Informatica, Politecnico di Torino, Italy

Volume

5

fYear

2003

fDate

6-10 April 2003

Abstract

The widespread adoption of compressed digital audio increasingly demands effective ways to conjugate ease of distribution with content protection. In this paper a low-complexity partial-encryption scheme for MPEG audio is presented. The aim is to provide listeners with sample-quality audio material that can be upgraded to full-quality by simply acquiring a key and decrypting a few selected bits (1-10% of the total bitstream) of the already available data. Sample-quality is obtained by limiting the frequency content of the signal, and it is achieved without altering the compatibility of the compressed audio bitstream. Audio material partially encrypted with the proposed scheme can thus be freely distributed for evaluation and then easily unlocked to achieve full quality without any further transmission of audio data.

Keywords

audio coding; code standards; copy protection; cryptography; data compression; MPEG audio; audio distribution; compressed digital audio; content protection; decryption; frequency-selective partial encryption; low-complexity partial-encryption scheme; quality upgrading; sample-quality audio material; Audio coding; Automatic testing; Cryptography; Digital audio players; Frequency; Protection; Speech; Streaming media; Telecommunication standards; Transform coding;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03). 2003 IEEE International Conference on

ISSN

1520-6149

Print_ISBN

0-7803-7663-3

Type

conf

DOI

10.1109/ICASSP.2003.1200059

Filename

1200059