I have done this with other parties by brute force for crypto. You usually have a ring of people and need 3 out of the 7 to open the box. You simply encrypt th

I have done this with other parties by brute force for crypto. You usually have a ring of people and need 3 out of the 7 to open the box. You simply encrypt the box in whatever combinations you want, and people run their keys against each layer of the box. You end up with a few different files but in the case of keys, and a small number of sharers this is not going to be a big data issue.