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Key Derivation Function?

Question asked by Jeff Campbell on Aug 16, 2016

Okay, I have a dumb question relating to CSE operations.  According to AN4234 (CSE Application Notes), I can't update any keys without generating K1, K2, and K3, and some other steps. These K values are only vaguely defined in terms of some key derivation function that is not specified.  I'm confused; is any key derivation function valid or is there one function in particular I'm supposed to use?


Would that function's definition be provided in the SHE Functional Specification? This standard is referenced numerous times but I can't find it anywhere and the website listed under AN4234's reference page is dead.


Edit: Still Googling.  I've found a large number of papers and slideshows that reference SHE and point to that dead website for details.  Hopefully I'll have better luck than this guy.