Source Identification
Definition
The branch of authentication that determines whether a recording originates from a claimed device, person, or system. Methods include Photo Response Non-Uniformity analysis, microphone fingerprinting, codec fingerprinting, and Electric Network Frequency analysis.
- Question addressed
- Whether a recording originates from a claimed device, person or system
- Methods
- PRNU analysis, microphone fingerprinting, codec fingerprinting, ENF analysis
- Field
- Media authentication
- Distinction
- Separate from content authentication (whether the recording was altered)
Common questions
How does source identification differ from detecting whether a file has been edited?+
Source identification asks which device, person or system produced a recording, using traces such as sensor pattern noise or microphone response, while tamper or manipulation detection asks whether the content of an already-attributed recording has been altered, and a media authentication examination often needs to address both questions separately.
Why might multiple source identification methods be applied to the same recording?+
Each method targets a different physical trace, for example PRNU relies on sensor imperfections in images and video while ENF relies on mains-frequency fluctuations embedded in audio, so combining applicable methods strengthens confidence in attribution beyond what any single technique can support alone.
Related terms
- C2PA (Coalition for Content Provenance and Authenticity)
- An open technical standard that embeds cryptographically signed provenance assertions into media files at the point of capture or editing. A C2PA...
- Deepfake
- Synthetic or AI-manipulated media in which a person's likeness, voice, or both are generated or substituted using machine learning methods. Detection relies...
- Integrity Verification
- The branch of authentication that determines whether a recording's content has been altered after original capture. Methods include metadata consistency checks, compression...
- Photo Response Non-Uniformity (PRNU)
- A fixed-pattern noise component caused by microscopic sensitivity differences between individual sensor pixels. PRNU is deterministic and camera-specific, making it a sensor...
- Steganography
- Concealing one file inside another in a way that hides the existence of the hidden file. LSB image manipulation, JPEG DCT coefficient...