随着计算能力的不断提高，密钥的安全性也需要进一步增强。目前可以接受的 RSA (Rivest-Shamir-Adleman) 密钥的强度是 2048 位。DigiCert 仅颁发使用 2048 位或以上 RSA 密钥的证书。目前可以接受的 ECC (Elliptical Curve Cryptology) 密钥的强度是 233 位。
补发或续订使用 2048 位（或以上）RSA 密钥或 233 位（或以上）EEC 密钥的证书。
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