I think you are looking for SSH certificates.

My favorite thing is learning things together. My kids express interest in things, and sometimes we do them together. When my first kid got interested in playing an instrument, I picked up the one I had not played in 10+ years, and we (re-)learned together. (At least until they got way better than me.) Other things we have learned together: playing tennis, snowboarding, 3D printing, building hutches for rabbits.