This is a great article on detecting that a photo had been altered, also using things like noise fingerprints: (original seems to be down rn, here's the archiv

This is a great article on detecting that a photo had been altered, also using things like noise fingerprints: (original seems to be down rn, here's the archive link): https://web.archive.org/web/20101229153120/http://www.hackerfactor.com/blog/index.php?/archives/322-Body-By-Victoria.html https://web.archive.org/web/20101229153120/http://www.hacker... And HN discussions, from 2009: https://news.ycombinator.com/item?id=1017726 https://news.ycombinator.com/item?id=1017726 and from 9 months ago: https://news.ycombinator.com/item?id=23538059 https://news.ycombinator.com/item?id=23538059