| 9 Apr 2021 |
 wiktor | I suggest searching for your favorite image format + specification and then CTRL+F "checksum" | 12:35:31 |
 rjhwelsh | It looks like png has checksums... | 12:44:34 |
| rjhwelsh | ..but something along the lines of "overkill" and "totally was not worth it". | 12:45:22 |
| rjhwelsh | http://www.dalkescientific.com/writings/diary/archive/2014/07/10/png_checksum.html | 12:45:27 |
| rjhwelsh | Jpeg does not have checksums | 12:46:16 |
 krismatrix | sorry...I somehow missed updates to this discussion. I appreciate the answers. Yes. I am looking for some way to establish strong legal proof that an artwork or photograph is mine. Copyright registration is one thing, but at $50+ a piece, it can get expensive quick. | 15:14:48 |
| krismatrix | So if I create a file is photoshop, gimp, krita or whatever, the png or jpegs they create have differing hashes each time I export. | 15:16:02 |
| krismatrix | I am trying to figure out what is the best way to establish strong proof. | 15:16:20 |
| krismatrix | A separate question on gpg. We can use gpg to sign. And this proves that I signed something (if I was indeed the person who signed the image). But the timestamp is unreliable. If I create the image on Jan 1 2021, but forget to sign. But on Jan 30th 2021, I got to my computer's clock and change the time back to an earlier date, gpg still signs. The only check it has (which is not bad) is that you cannot sign older than a date when the file was created). | 15:29:16 |
| rjhwelsh | Maybe something like steganography or invisible digital watermarking? | 15:33:53 |
| krismatrix | how would one do that? | 15:54:20 |
| rjhwelsh | I've only heard about it.
This was one of my google hits for "linux" "watermark" "steganography":
https://www.howtoforge.com/tutorial/linux-image-steganography-and-watermarking/ | 16:03:13 |
| rjhwelsh | I also found a paper discussing techniques that are robust to image manipulation, but I can't find it now and it was behind a paywall. | 16:09:15 |
| krismatrix | hmm | 16:25:19 |
| 10 Apr 2021 |
 Aroop Roelofs | turn image into zip and done xD | 17:25:18 |
| Aroop Roelofs | 9y/o me wants to know your location D: | 17:25:28 |
| rjhwelsh | Aroop Roelofs: Can you explain how turning an image into a zip can establish you are the owner of an image? Or was it in relation to bitrot? | 23:24:19 |
| 11 Apr 2021 |
| Aroop Roelofs | It was a joke | 01:13:15 |
| rjhwelsh | Oh... Whooosh! | 01:24:45 |
| Aroop Roelofs | yes :p | 08:25:48 |
| Aroop Roelofs | We used to do that back in the days :p
Turn an image into a zip, dump our "secret files" (more often than not, just our stash of hentai n stuff) in it and done :p
To the naked eye, it doesn't look that suspicious, if you click it, it just opens as an image.
THen you realize it's a 40GB JPEG :^)
But even then, only those that knew about the trick (a.k.a not our parents and teachers) knew what to do with it :p | 08:28:08 |
| 13 Apr 2021 |
|  JulHer left the room. | 14:24:00 |
| 14 Apr 2021 |
|  @drrenardscd:matrix.org joined the room. | 07:28:43 |
| @drrenardscd:matrix.org joined the room. | 09:43:37 |
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|  @useraccount:nitro.chat removed their profile picture. | 21:15:01 |
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| 17 Apr 2021 |
|  Nausiyan Nyan joined the room. | 06:09:18 |
