The user you specify with the Run As field when scheduling a replication job requires full access to both the key and the data directories being replicated. This is not a recommended best practice for KMS management.
If you change permissions in the KMS to enable this requirement, you could accidentally
provide access for this user to data in other encryption zones using the same key. If a user
is not specified in the Run As field, the replication runs as the
To access encrypted data, the user must be authorized on the KMS for the encryption zones they need to interact with. The user you specify with the Run As field when scheduling a replication must have this authorization. The key administrator must add ACLs to the KMS for that user to prevent authorization failure.
Key transfer using the KMS protocol from source to the client uses the REST protocol, which requires that you configure TLS/SSL for the KMS. When TLS/SSL is enabled, keys are not transferred over the network as plain text.