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A piece of data used in public key cryptography (specifically public key infrastructures) that contains identifying information (i.e. email address or web address), a hash of a public key, and a digital signature that authenticates the data in the certificate. For questions specifically about [x509], [certificate-authority], or [public-key-infrastructure], please use those tags.

6 votes
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"A third party is capable of monitoring your network activity" with [imported] certificates?

If you add a root certificate to your device, that cert could be used to sign SSL certificates for any domain. … That's not too different from any other root CA signing certificates they actually shouldn't sign, but the risk is certainly higher with a self-added "random" root CA like CAcert. …
Joel's user avatar
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31 votes

Chrome SSL Warning: "You cannot proceed because the website operator has requested heightene...

This is a feature called HTTP Strict Transport Security - see http://dev.chromium.org/sts and http://en.wikipedia.org/wiki/HTTP_Strict_Transport_Security. Sites that send the Strict-Transport-Securit …
Joel's user avatar
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7 votes

What issues arise from sharing a SSL certificate's private key?

Using the same certificate on many (trusted) servers does not cause problems by itself. The main problem will be in the case of the private key falling into the wrong hands (from any of the many vend …
Joel's user avatar
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