The HPKP tracking problem is described in section 5
https://datatracker.ietf.org/doc/draft-ietf-websec-key-pinni...
which also includes another description of this HSTS problem.
https://datatracker.ietf.org/doc/draft-ietf-websec-key-pinni...
which also includes another description of this HSTS problem.
http://www.chromium.org/Home/chromium-security/client-identi...