Hi Henk, Frank, Michael, Bob,

thanks for this document.

I have a question regarding the IEEE 802.1AR-based of the description.

Here is what I understand for use of certificates from 802.1AR (with my wording 
because RFC 2119 language is often missing in the 1AR spec):

* The DevID certificate subject field is always present, but can be empty. An 
IDevID certificate subject field MUST be non-null and SHOULD include a unique 
device serial number encoded as the serialNumber attribute. The subject field 
can contain information identifying the supplier or manufacturer of the device.
* IDevIDs SHOULD use the GeneralizedTime value 99991231235959Z in the notAfter 
field.
* The subjectAltName extension MAY be present in both DevID certificates and 
DevID intermediate certificates. If a DevID certificate includes a 
subjectAltName, that field should include a HardwareModuleName. When a TPM is 
used to provide DevID module functionality the IDevID certificate contains a 
subjectAltName that uses a HardwareModuleName to identify the TPM, the hwType 
identifying the TPM Version and the hwSerialNum containing the TPM Serial 
Number.
* All certificates contain the authorityKeyIdentifier (as a non-critical 
extension).
* Intermediate certificates contain the subjectKeyIdentifier, as a non-critical 
extension. The subjectKeyIdentifier extension SHOULD NOT be included in DevID 
certificates.
* If a critical keyUsage extension is included in the IDevID, it MUST include 
digitalSignature. The keyUsage extension MAY include keyEncipherment.

Is my reading of IEEE 802.1AR correct?

Ciao
Hannes

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