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In this case, if understand the concept correctly, it would be iTunes that pins the certificate authority for the iTunes server. One would still be vulnerable

by markild 14y ago

In this case, if understand the concept correctly, it would be iTunes that pins the certificate authority for the iTunes server. One would still be vulnerable of a corrupt CA. The only solution to this would be to issue all certificates from an internal CA and verify this in your application.

StavrosK 14y ago
Or you could just harcode the certificate fingerprint and refuse to accept anything else. It's trivial when you own the client. I'm not sure if this would break when you needed to renew the certificate, but I guess you only update the signature, not the actual public key.
- sp332 14y ago
  But if China is already MITM, they can modify or replace the binary while you are downloading it.
  - StavrosK 14y ago
    Yep. In that case, you don't own the client.
phillmv 14y ago
When you ship your own browser and OS you can prob get away with that.