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For each custom hostname certificate you request, Cloudflare issues two certificates that are bundled in chains that maximize browser compatibility (unless you upload custom certificates). The primary certificate uses a P-256 key, is SHA-2/ECDSA signed, and will be presented to browsers that support elliptic curve cryptography (ECC). The secondary or fallback certificate uses an RSA 2048-bit key, is SHA-2/RSA signed, and will be presented to browsers that do not support ECC.

Once issued, certificates are valid for 1 year and renew automatically 30 days before expiration. Renewals require no action from you or your customer.