Perceptual cryptography on MPEG Layer III bit-streams

Author

Torrubia, Andrés ; Mora, Francisco

Volume

48

Issue

4

fYear

2002

fDate

11/1/2002 12:00:00 AM

Firstpage

1046

Lastpage

1050

Abstract

Whereas conventional cryptography is suitable for any kind of data, it does not allow for perceptual degradation of encrypted data in multimedia-compressed formats. We present perceptual cryptography applied to MPEG Layer III compressed audio (MP3). The inputs of the cipher are the plaintext MP3 bit-stream, encryption key and encryption percentage. The cipher outputs a MPEG Layer III compliant bit-stream (ciphertext) that is perceptually less valuable than the original bit-stream. The original MP3 bit-stream can be recovered using the ciphertext bit-stream and the same decryption key and percentage used on encryption. An introduction to MP3 audio compression is given followed by a description of the perceptual cipher and its applications. The paper addresses the relationship between the encryption percentage and the subjective quality.

Keywords

ISO standards; audio coding; code standards; cryptography; data compression; decoding; multimedia communication; telecommunication standards; ISO; MP3 audio compression; MPEG Layer III bit-streams; MPEG Layer III compressed audio; ciphertext bit-stream; decryption key; encryption key; encryption percentage; multimedia-compressed formats; perceptual cipher; perceptual cryptography; perceptual degradation; plaintext MP3 bit-stream; subjective quality; Audio compression; Codecs; Cryptography; Degradation; Digital audio players; Electronic mail; Multimedia systems; Protection; Streaming media; Transform coding;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/TCE.2003.1196437

Filename

1196437