title: Signature Algorithm sha256RSA with ECC Pubkey
body: <p>Quite by chance, I ran into Google certificate. Now questions come to my mind which I haven't find answers yet:</p>
  
  <p>From the certificate, it seems RSA signature algorithm is used, but the public key is an ECC key. Can we possibly do RSA encryption/decryption with an ECC key? How can we make a certificate like this using openssl? (I've created certificates of RSA SA/RSA key, ECDSA SA/ECC key, but not like this one.)</p>
  
  <p>Any answer is appreciated!</p>
  
  <p>Screenshot of Google certificate
  <a href="https://i.stack.imgur.com/OsoG5.jpg" rel="nofollow noreferrer">Google Certificate</a></p>