tsig-04 Time expire/Time Signed

[Mark.Andrews@cmis.CSIRO.AU]

	These fields are specified as unsigned 32 bit ints.  Now these
	have fields have a limited lifetime of ~110 years (with
	potential implementation problems in 40 years time).  Now while 
	most of us are unlikely to be around in 110 years that is a chance
	that the TSIG will still be in use in 110 years time.  Remeber lots of
	current code is already ~40 years old and is still in use.

	Now SIG has a similar problem to this and I'm not sure what they
	intended to do about this.

	Mark
--
Mark Andrews, CSIRO Mathematical and Information Sciences
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