MLS Interim 2022-12-16

Mls-arch: Good to go, will publish a draft as soon as -protocol goes

MLS-proto

*   \#841
    *   No need for private use labels
    *   Add table for exporter labels
    *   Marta found a typo
    *   Otherwise ready to merge

*   \#839
    *   ContentAAD -> PrivateContentAAD?
    *   GroupContent
        *   Generally, folks would prefer Message/Frame
        *   Resolved: FramedContent
    
    *   Public/PrivateMessage ~> Signed/EncryptedMessage?
        *   Public/Private ok

*   \#836
    *   Ready to merge

*   \#837
    *   Need to note “non-blank” intermediates
    *   Seems efficient enough, doesn’t harm correctness
    *   Otherwise ready to merge

*   \#838
    *   Performance gains not worth the risk
    *   Safeguards against mistakes in bookkeeping
    *   Doable in an extension, new proposal type
    *   Close

Mls-extn

*   Targeted messages
    *   Concern over re-useing leaf HPKE keys
    *   Agreement to add a separation label to main document, parallel
        to SignWithLabel
    *   No resolution on whether to re-use leaf HPKE keys

*   Joël proposal: Send to group from external
    *   Raphael: Sure, was in the spec long ago, probably authentication
        is the most challenging thing

*   Content advertisement