Discussed ABE with Non-monotonic Access Structures

Basically ABE scheme with addition of "not" keys.  i.e. can encrypt something with "not history" department.

bilinear groups using elliptical curve crypto <-- we are wondering if we want to read something on this since it is standard background.

Excluding is much simpler. Someone is excluded as part of key.  Allows more information.

Potentially have 2x the number of keys? (a "not" for every attribute)

We could calculate the smallest number of keys with which to sign a msg to allow set(s) and disallow other set(s).