Does InterSSL deliver SSL certificates for ECC (Elliptic Curve Cryptography) and ECDSA ?

Yes, all SSL certificates from COMODO also support ECC (Elliptic Curve Cryptography), to be more precise they are supporting ECDSA keys.

This is an example for openssl how to create a key/CSR pair for ECDSA:

 openssl ecparam -genkey -name secp384r1 | openssl ec -out ec.key
openssl req -new -key ec.key -out ec.csr

You can also reissue your certificate from RSA to ECC algorithm. As a bonus, your RSA certificate will remain valid, hence you can install both on your server.

Please ensure that also your server is properly configured for ECC / ECDSA!

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