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In distributed systems users need the ability to share sensitive content with multiple other recipients based on their ability to satisfy arbitrary policies. One such system is electricity grids where finegrained sensor data sharing holds the potential for increased reliability and efficiency. However, effective data sharing requires technical solutions that support flexible access policies, for example, sharing more data when the grid is unstable. In such systems, both the messages anddoi:10.1145/1533057.1533093 dblp:conf/ccs/BobbaKAA09 fatcat:6yxfi4pqv5dyzggnngx3keh3my