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Issues..
Why not use the option in RFC 4285?
Why do we need HKE and AT in FBU/FBack?
Why SPI = 0 needed?
Resolution:
Remove HKE field?
If SPI is set to zero, the HKE is SEND-based
If a new HKE is to be defined, relies on reserving an SPI value. Good idea?
Remove AT field?
Yes, AT is set by the key derivation mechanism (AAA, SEND)

PPT Version