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I would like to know how widely ECC is being used today (or has been used in recent years). How do I find data about this? Also, what are good metrics for quantifying this?

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The best source you probably have, apart from doing a broad scan yourself, is to check the Certificate Transparency logs. Only a few days ago, someone tweeted a statistic from those logs (I could not find a better source for it than twitter, so take it with a grain of salt).

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    Elliptic curve Diffie Hellman (ECDHE) can be used with RSA certificates. So the certificate would show as RSA in the CT logs, but for setting up the connection ECC would be used. – Sjoerd May 11 '17 at 9:12
  • That is correct, thanks for pointing it out @Sjoerd. The question is a very broad one, hard to figure out what the OP really wants to know. – mat May 11 '17 at 10:59

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