Forensic Authenticity Analyses of the Metadata in Re-Encoded iPhone M4A Files

Koenig B, Lacey D. Forensic Authenticity Analyses of the Metadata in Re-Encoded iPhone M4A Files. In: AES Conference: 2017 AES International Conference on Audio Forensics. Audio Engineering Society; 2017. Paper 1-3. Available from: https://aes.org/publications/elibrary-page/?id=18738

@inproceedings{Koenig2017_18738,
  author = {Koenig, Bruce and Lacey, Douglas},
  title = {{Forensic Authenticity Analyses of the Metadata in Re-Encoded iPhone M4A Files}},
  booktitle = {AES Conference: 2017 AES International Conference on Audio Forensics},
  note = {Paper 1-3},
  year = {2017},
  month = jun,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=18738}
}

TY  - CPAPER
TI  - Forensic Authenticity Analyses of the Metadata in Re-Encoded iPhone M4A Files
AU  - Koenig, Bruce
AU  - Lacey, Douglas
T2  - AES Conference: 2017 AES International Conference on Audio Forensics
M1  - Paper 1-3
PY  - 2017
DA  - 2017/06/06
UR  - https://aes.org/publications/elibrary-page/?id=18738
PB  - Audio Engineering Society
LA  - en
AB  - Detailed digital data analyses were conducted of the metadata contained in files produced on four iOS apps and then re-encoded with four (4) common audio/media editing programs, producing a total of twenty (20) separate M4A files. The purpose of this research was to identify changes made to the M4A file structure and metadata content by the re-encoding processes as they related to forensic audio authenticity examinations. The research found that the re-encoding processes produced clearly discernible differences, compared to the original M4A files. The M4A metadata format structure, the procedures followed, the changes identified in the metadata of the re-encoded files, and a discussion of the authenticity implications are listed.
ER  -