41 lines
1.4 KiB
Markdown
41 lines
1.4 KiB
Markdown
# MSC3122: Deprecate starting key verifications without requesting first
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Currently, the [Key verification
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framework](https://matrix.org/docs/spec/client_server/r0.6.1#key-verification-framework)
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allows a device to begin a verification via to-device messages by sending an
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`m.key.verification.start` event without first sending or receiving an
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`m.key.verification.request` message. (The last sentence of the 5th paragraph
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of the Key verification framework in the unstable spec, as of the time of
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writing.) However, doing so does not provide a good user experience, and
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allowing this adds unnecessary complexity to implementations.
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We propose to deprecate allowing this behaviour.
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Note that verifications in DMs do not allow this behaviour. Currently, Element
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Web is the only client known to do this.
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## Proposal
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The ability to begin a key verification by sending an
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`m.key.verification.start` event as a to-device event without a prior
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`m.key.verification.request` is deprecated. New clients should not begin
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verifications in this way, but will still need to accept verifications begun in
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this way, until it is removed from the spec.
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## Potential issues
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None.
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## Alternatives
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We could do nothing and leave it in the spec. But we should clean up cruft when
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possible.
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## Security considerations
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None.
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## Unstable prefix
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No unstable prefix is required since we are simply deprecating behaviour.
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