This is great! The privacy problem is especially interesting because I work on a distributed key management system called NuCypher. We use proxy re-encryption

This is great! The privacy problem is especially interesting because I work on a distributed key management system called NuCypher. We use proxy re-encryption to do this and have a distributed network of nodes that perform the actual re-encryption on split keys. If anyone is reading this article and wants to work on this problem, we have a split-key threshold PRE scheme called Umbral that we used to decentralize the key management part. The link is below: https://github.com/nucypher/pyUmbral https://github.com/nucypher/pyUmbral