SSL Algorithms

DigiCert SSL/TLS certificates offer RSA and ECC encryption algorithms—to help you create a more secure and scalable future for your business.

Elliptic Curve Cryptography (ECC) Algorithm

ECC provides stronger security and increased performance: it offers better protection than currently adopted encryption methods, but uses shorter key lengths (e.g. 256 bit ECC key provides the same level of security as 3,072 RSA key). The result? Stronger security that can handle the explosion in mobile device and tablet connections.


Requires fewer server processing cycles, allowing for more simultaneous SSL connections and faster processing. ECC key lengths increase at a slower rate than other encryption method keys as security levels increase, potentially extending the life of your existing hardware and giving you a greater return on your investment.


DigiCert's ECC certificate roots have been in place for over five years: You can be confident that your ECC certificate will work throughout your ecosystem.


US Government approved: ECC is FIPS-certified (US Federal Information Processing Standard) and endorsed by the US National Security Agency. 

ECC Algorithm

Digital Signature Algorithm (DSA)

  • A DSA certificate is included at no additional cost with all DigiCert Standard and Premium SSL certificates.
  • Delivers the same level of security and performance as the RSA algorithm, but uses a different algorithm for signing and encryption.
  • Offers a broader array of encryption options: You can install just RSA, just DSA, or both to enhance website security. (Apache server can support both RSA and DSA certificates in tandem on a single web server.)
  • Gives you more choices and greater flexibility to help make it easier to keep up with evolving national government requirements.
  • Helps maximize your ecosystem reach to everyone with whom your company does business.
  • DSA is US Government approved: DSA was created by the NSA in 1991 and is US Defense Security Service and FIPS-certified.

Beginner's Guide to SSL/TLS

SSL/TLS Explained

Whether you are an individual or a company, you should approach online security in the same way that you would approach physical security for your home or business.

This guide will de-mystify the technology involved and give you the information you need to make the best decision when considering your online security options.


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