Auto generated vs manual / "Was this image captured on the phone that generated the proof?"

[n8fr8]

Just putting some thoughts here to discuss this week about how analysis of Proofmode data + JPEG EXIF Data can tell if the photo had proof "auto generated" vs manually, as well as if the photo or video was taken on the phone vs downloaded from elsewhere

1. the timestamps of the proof generation, the file system last modified captured in the proof csv, and the EXIF created / modified date and GPSDateStamp are all within some minimum of time, i.e. 1 minute
2. the path of the media file is in a typical "capture" path vs a download path or an application folder on storage
3. the EXIF fields that contain information about the camera (Make/Model/Software) correspond with the information about the device captured by ProofMode
4. GPS location data captured in the EXIF roughly match those in the Proofmode data
5. Compare sensor noise between series of "Identity Photos" and captured photo (goes back to CameraV technique)

[ngengesenior]

Some thoughts on this

• Point number 2 about the path might not really make sense in some cases since the user can move files to other directories, for example, a file downloaded from the internet in the Downloads directory and moved to the Public Pictures directory.
• Point 3 can work a little easy if we use the ExifInterface and we compare the necessary values gotten from the tags. Point 4 will also work from this.

https://android-developers.googleblog.com/2016/12/introducing-the-exifinterface-support-library.html