Timeline for Is there a digital time-stamping scheme that does not rely on a time-stamping authority?
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| Jul 11, 2017 at 1:55 | comment | added | Swapnil Bhatia | @todd thanks for some interesting examples and avenues. As agentme points out, I am looking for an absolute timestamp provable to be within delta. Yes, I am open to a solution that involves events. Your chain of thoughts on celestial images is similar to the tracks I thought would be needed for this. I look forward to other ideas. Thanks again. | |
| Jul 8, 2017 at 1:30 | comment | added | Kind Contributor | @AgentME Correct. That passage was a discussion about relative events. That example showed the use of a connection of events. I didn't claim it would work for "timestamping" situations. My answer was that it was not technically possible to do without a trusted authority/witness, but I suggest if there is a solution others should think down the path of "events" not "time". | |
| Jul 7, 2017 at 20:03 | comment | added | Macil | Timestamping based on bundling an item with a newspaper headline or a photo of the night sky works to establish that an event happened after another thing (the hostage is still alive after this point in time), but it doesn't work for establishing that an event happened before another thing (I invented this machine design before company X filed for a patent on it) because anyone in the future could find an old newspaper headline, sky photo, etc. | |
| Jul 7, 2017 at 3:53 | comment | added | Kind Contributor | You may have misunderstood (or I wasn't clear enough). RE: "photoshopping" - that would involve faking telescope and camera pictures of certain positions of celestial bodies. That's not equivalent to a hash collision, one can know the right positions for a given time and fake them visually in a picture. As I said, it was not a perfect scheme, but food for thought. | |
| Jul 7, 2017 at 3:14 | comment | added | Paul Uszak | If you could successfully Photoshop a time stamped image, that would effectively be creating a hash collision in a modern hash like SHA256/512. It's not possible (yet). | |
| Jul 7, 2017 at 1:35 | history | answered | Kind Contributor | CC BY-SA 3.0 |