added ref to uccs in the context of secure channel

Author: henkbirkholz

draft-ietf-rats-reference-interaction-models.md

@@ -58,6 +58,7 @@ normative:
 informative:
   I-D.birkholz-rats-tuda: TUDA
   I-D.tschofenig-rats-psa-token: psa-token
+  I-D.ietf-rats-uccs: uccs
   DAA:
     title: Direct Anonymous Attestation
     author:
@@ -205,7 +206,7 @@ Integrity:
 : Information provided by an Attester MUST NOT have been altered since it was created. This may be achieved via symmetric cryptography, e.g., using COSE Mac0 as in PSA TF-M profile ({{Section 5.2 of -psa-token}}), or asymmetric, like ECDSA.
 
 Authentication:
-: The information provided by the Attester MUST be authentic. To do this, the Attester should authenticate itself to the Verifier. This can be done through implicit authentication using a digital signature over the Attestation Evidence, which does not require additional protocol steps, or by using a secure channel including authentication.
+: The information provided by the Attester MUST be authentic. To do this, the Attester should authenticate itself to the Verifier. This can be done through implicit authentication using a digital signature over the Attestation Evidence, which does not require additional protocol steps, or by using a secure channel (see {{-uccs}}) including authentication.
 
 # Normative Prerequisites