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Direct Encryption Mode: Wording Improvement #64

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Direct Encryption Mode: Wording Improvement #64

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7 changes: 3 additions & 4 deletions draft-ietf-cose-hpke.md
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Expand Up @@ -123,11 +123,10 @@ is a bstr.

### HPKE Direct Encryption Mode {#one-layer}

This mode is selected if COSE_Encrypt0 structure uses a COSE-HPKE algoritm.
This mode applies if the COSE_Encrypt0 structure uses a COSE-HPKE algorithm and has no recipients.

Because there are no recipients, COSE_Encrypt structure MUST NOT be used.

Because COSE-HPKE supports header protection by definition, if 'alg' parameter is present, it MUST be in protected bucket, and SHALL be a COSE-HPKE algorithm.
Because COSE-HPKE supports header protection, if the 'alg' parameter is present, it MUST be included
in the protected header and MUST be a COSE-HPKE algorithm.

Although the use of the 'kid' parameter in COSE_Encrypt0 is
discouraged by RFC 9052, this documents RECOMMENDS the use of the 'kid' parameter
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