Monday, September 21, 2020

Video and Image Analysis - Authentication




Video authentication 

Video authentication is a process that is used to obtain the trustworthiness of a digital video and to assure a video hasn't been altered or tampered.


Performing Authentication Examinations of Imagery and Videos

Review visible scene content:

  • Shadows
  • Lighting
  • Density
  • Texture/Patterns (skin and background pattern)
  • Gravity
  • Physical body details (hair, muscles, body curves)
  • Contact with other objects and body
  • Skin to skin contact
  • Imperfections on body
  • Consistencies/Inconsistencies


Visual scene content includes low-quality synthesized faces, visible splicing boundaries, color mismatch, visible parts of the original face, inconsistent synthesized face orientations.








Review non-scene content:
  • EXIF info (duration, GPS, software writer, codec)
  • Comparing signatures of camera to video/image in question 
  • Behavior of file type (compression type) 
  • Reviewing binary structures and sequence of bytes in the hex of the file
  • Evidence of being opened in a video editor 
Viewing the EXIF data of a file



Using structural analysis from the video forensic tool (link MEDEX forensics) showing a video editing tool was detected in the structure of the video file.






Reference:

https://medexforensics.com/#applications-span

https://cognitech.com/

https://arxiv.org/pdf/2001.06564.pdf




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