CDs Have Fingerprints Too

Abstract. We introduce a new technique for extracting unique fingerprints from identical CDs. The proposed technique takes advantage of manufacturing variability found in the length of the CD lands and pits. Although the variability measured is on the order of 20 nm the technique does not require the use of microscopes or any advanced equipment. Instead, the electrical signal produced by the photodetector inside the CD reader will be sufficient to measure the desired variability. We investigate the new technique by analyzing data collected from 100 identical CDs and show how to extract a unique fingerprint for each CD. Furthermore, we introduce a technique for utilizing fuzzy extractors over the Lee metric without much change to the typical code offset construction. With the aid of the proposed fuzzy extractor we give specific parameters and code constructions to convert the derived fingerprints into 128-bit cryptographic keys. Key words: Optical discs, fingerprinting, digital rights m...

• Type: Conference
• Year: 2009
• Where: CHES
• Authors: Ghaith Hammouri, Aykutlu Dana, Berk Sunar
• Keywords: CHES 2009, Cryptography, Fuzzy Extractor, Identical Cds, Technique Takes Advantage