Forensic Working Group

Latest News

The Multimedia Authentication Testing (MAT) form establishes a DNA style authentication testing roadmap, and remains the industry's most widely accepted industry blueprint for authentication testing of digital recordings.

Due to ongoing industry innovations, and the adoption of recent peer-reviewed forensic tests, the Forensic Working Group is accepting comments toward the development of the next generation MAT form (version #5).

While a certified AVFA (Audio Video Forensic Analyst) is expected to be familiar with MAT analysis, those with less familiarity with multimedia authentication are expected to acquire the required audio and video training prior to its forensic application with the court.

Coming soon

About the FWG

The Forensic Working Group (FWG) is a collaborative group dedicated to the effective scientific application and presentation of digital forensics to the courts, government, business and general public through analysis, reporting, testimony and educational outreach.

The members of the FWG serve as triers of fact in all facets of private and public sectors, applying peer reviewed science and best practices to real world scenarios involving image, video and audio data in order to form enhancement, authentication, measurement and identification opinions that can be conveyed to a non-technical audience.

The FWG works in conjunction with industry groups, including the NIST OSAC Standards group, to establish industry standards and qualifications to assist judges in sorting out expert in this field and those unsuitable to testify as an expert.

Composed of practitioners, scientists, scholars, and litigators, members of the Forensic Working Group members operate in accordance with the strictest industry ethics and scientific foundations.

Standardized Testing

The MAT (Multimedia Authentication Testing) form unifies the workflow of the industry's standardized suite of forensic tests, for the purpose of assessing the authenticity of digital auditory and visual recordings.

Compiled from decades of forensic experience with analysts and scientists worldwide, The MAT form provides a consistent road map of comprehensive testing, for reliance by triers-of-fact, courts, and all parties, without an outcome or software bias.

The MAT form requires a comprehensive understanding of file size, hash, format, codec, writing library, streams, geo-spatial, audit data, bit rate/depth, header data, speed, synchronization, cloning, data voids, tracking, impulses, continuity, histogram, compression, noise aberrations, data correlations, clipping, spacial-temporal inconsistencies. Auditory streams include tests for bias & frequency tracking, and subsonic analysis. Visual streams include tests with tiling, interlacing, color space, resolution, thumbnail, PCA/DCT/JPEG editing, gradient, and imager data.

Industry Links

American Academy of Forensic Sciences)

National Institute of Standards and Technology

Comprehensive course on Digital Visual Media Anti–Forensics and Counter Anti–Forensics by Raahat D Singh. MAT familiarity suggested.

"Open-source software - the forensic video analyst" by Doug Carner of Forensic Protection

"The Digital Detectives - The Key to Understanding Digital Evidence" by Jennifer E. Owen.

The 2009 National Academies book "Strengthening Forensic Science in the United States." It's a great look at the current state of forensic science (pretty dismal) along with suggestions for how to move forward so that more disciplines have credibility to DNA identification." More information here & here.


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