olemus krüptograafias:
sertifikaat, mis sertifikaatide hierarhilises ahelas
tuleneb juursertifikaadist, kuid pole lõpptaseme sertifikaat
=
a subordinate certificate issued by the trusted root certificate authority and provided to certificate providers to give them the authority to issue end-entity certificates

ülevaateid
https://www.venafi.com/blog/what-difference-between-root-certificates-and-intermediate-certificates

https://en.wikipedia.org/wiki/Chain_of_trust

https://www.uio.no/studier/emner/matnat/ifi/IN3210/h19/slides/03-pki.pdf

vt ka
- avalku võtme taristu
- usaldusmudel