Oh, and a specific attack against your scenario? Sure!
https://hackerfactor.com/blog/index.php?/archives/1037-C2PA-and-Untrusted-Certificates.html. Scroll down to the section "See One, Do One, Teach One". There's an example that does it.
Hacker Factor /
npub1ju…sse9n
2024-08-05 17:19:44
in reply to nevent1q…pvar
Author Public Key
npub1juzxwk54l455a96gh2ujty02wt3urjhht4q2uwzq8ctjvt26e88q7sse9nSeen on
wss://relay.momostr.pinkPublished at
2024-08-05 17:19:44Event JSON
{
"id": "79cd9d7f993fb2a30f3b78042523f4960704c2306a24dda95d1f7b7498b4d990",
"pubkey": "9704675a95fd694e9748bab92591ea72e3c1caf75d40ae38403e17262d5ac9ce",
"created_at": 1722878384,
"kind": 1,
"tags": [
[
"p",
"2f3afe951cf211bd163306f5698222e2f16c25b928743efba74f3d135d848c10"
],
[
"p",
"9704675a95fd694e9748bab92591ea72e3c1caf75d40ae38403e17262d5ac9ce"
],
[
"e",
"3170c0ed9d1cc137745f9720ab61bb0c7fe293c35757092c127db272e751f45a",
"",
"reply",
"2f3afe951cf211bd163306f5698222e2f16c25b928743efba74f3d135d848c10"
],
[
"proxy",
"https://noc.social/@hackerfactor/112910557799915724",
"web"
],
[
"e",
"f7dc1df3c941d1665e4ef6be577ed170700ea18398441c4bb978151172266ae3",
"",
"root",
"2f3afe951cf211bd163306f5698222e2f16c25b928743efba74f3d135d848c10"
],
[
"p",
"8c3cd29c32329fabbe47614cc7be0051e2ae8fbb2779704462c9fa14d01840b8"
],
[
"proxy",
"https://noc.social/users/hackerfactor/statuses/112910557799915724",
"activitypub"
],
[
"L",
"pink.momostr"
],
[
"l",
"pink.momostr.activitypub:https://noc.social/users/hackerfactor/statuses/112910557799915724",
"pink.momostr"
],
[
"-"
]
],
"content": "Oh, and a specific attack against your scenario? Sure!\nhttps://hackerfactor.com/blog/index.php?/archives/1037-C2PA-and-Untrusted-Certificates.html. Scroll down to the section \"See One, Do One, Teach One\". There's an example that does it.",
"sig": "332506e53befe3d6a8fa24ddd0032a113271cb6dfbbf1f7191fcd5030a03a12e84a2c66bba2e416ec2d6bccefc0dcc4ad6a2bd0a34565f37906699a2ba4a3774"
}