On 14 July 2017 at 15:42, Yoav Nir <ynir.ietf@xxxxxxxxx> wrote: > While it may be OK to share a key with my phone (but too difficult to do > securely in practice), sharing with a delegate is hairy on many different > layers. But still it’s the same issue. I think it's all solvable using Proxy Re[en]cryption, but that seems to be a little fraught with patents at the moment. Dave.