this post was submitted on 13 Dec 2025
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Why is it the first time I hear of this?
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Ah, because it's apparently a fresh proposal, perhaps from Mastodon themselves.
https://www.w3.org/wiki/ActivityPub/Primer/Authentication_Authorization mentions HTTP signatures since the very first version of the document in 2017. The current efforts seem more in the direction of describing standardizing the existing usage.