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One way ActivityPub can be extended is — through JSON-LD namespaces.
For example, many Fediverse servers use the following JSON-LD namespace to specify cryptographic public-key(s) for the user.
(This particular namespace is an HTTPS URL.)
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But, does extant Fediverse software support cryptographic public-key(s) well?
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#ActivityPub #Cryptography #Fedidev #Fedidevs #Fediverse #JSONLD
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To handle public-key cryptography safely, often a user should be able to have multiple public-keys.
For example, a user might have a different public-key on each device, rather than sharing public-keys.
A user might delegate to a 3rd party — and there may be a delegated versus non-delegated public-key distinction.
Key-rotation is also often necessary for safety reasons.
Etc.
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#ActivityPub #Cryptography #Fedidev #Fedidevs #Fediverse #JSONLD
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