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Update proposals for draft-tschofenig-cose-cek-hkdf-sha256-01 #104

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Update proposals for draft-tschofenig-cose-cek-hkdf-sha256-01 #104

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  • Add citation to "Legacy Encryption Downgrade Attacks against LibrePGP and CMS"
  • Add another condition: RFC 9459 violation
    • our mitigation is not necessary if ALL of recipients are compliant with RFC 9459, in other words,
    • it protects sender's secret even with the situation where one or more recipients may violate RFC 9459

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