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Installing the CAcert.org class 3 certificate on the N73

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As it takes a while to find the right information through search engines, here's how to install a 3rd-party X.509 CA certificate to the Nokia N73 (and other S60 platform, 3rd edition or later, phones):

  • You'll need a DER encoded certificate, PEM doesn't work.
  • The web server with the certificate has to return content type application/x-x509-ca-cert

Unfortunately, CAcert.org's web server currently returns text/plain for the DER-encoded class 3 certificate. The documentation from Nokia describes how to install it by transferring the cert file to the phone. I haven't tried that, though. Instead, I simply copied the DER file to my own web server, which returns the correct content type, and downloaded it from there with the phone.

NB: This applies to certificate authority certs for TLS connections only, not for application signing.

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