I think the guidance on session resumption needs to be more prescriptive as to 
what constitutes the best practice.

The session resumption behavior as a whole needs to be a SHOULD.

However if you support Session resumption behavior then :-

*         The session tickets MUST be encrypted with an equivalent cipher to 
the main TLS cipher

*         Session ticket lifetime MUST  be limited to < 1 day

*         Ticket keys MUST be changed at least once a week.

You may have reasons to not follow these guidelines, but to do so would not be 
a best practice.
Trevor
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