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SSL Certificates to Meet Any Need
Learn how SSL secures online connections and
protects sensitive data.
What is an SSL Certificate?
Digital certificates serve as the backbone of internet security.
Secure Sockets Layer (SSL) certificates, sometimes called digital certificates, are used to establish an encrypted connection between a browser or user's computer and a server or website. The SSL connection protects sensitive data, such as credit card information, exchanged during each visit, which is called a session, from being intercepted from non-authorized parties.
Creating a Secure Connection
SSL is the standard security technology for establishing an encrypted
link—here’s how it works.
Invisible to the end-user, a process called the “SSL handshake” creates a secure connection between a web server and a browser. Three keys are used to create a symmetric session key, which is then used to encrypt all in-transit data.
link—here’s how it works.
- Server sends a copy of its asymmetric public key to browser.
- Browser creates a symmetric session key and encrypts it with the server’s assymmetric public key then sends it to the server.
- Server decrypts the encrypted session key using its asymmetric private key to get the symmetric session key.
- Server and browser now encrypt and decrypt all transmitted data with the symmetric session key. This allows for a secure channel because only the browser and the server know the symmetric session key, and the session key is only used for that specific session. If the browser was to connect to the same server the next day, a new session key would be created.
Why You Should Use a Digital Certificate
Establish trust and online security for your website visitors and business.
Encrypt sensitive data
Activate HTTPS and the lock icon
Comply with PCI standards
Prove legitimacy
Strengthen brand identity
Increase SEO rank
Choose the Right SSL
Not sure which SSL certificate you need? Scan the chart below to find the certificate that best meets your site security needs.
As of February 21, 2018, DigiCert only offers 1 and 2-year public SSL/TLS certificates. Learn More.
Product Features
Award-winning customer support
Compatible with all major browsers
and mobile devices
and mobile devices
Secures both www.example.com
and example.com
and example.com
Displays the green address bar
Secures unlimited subdomains
Technical Specifications
Standard X.509 certificates
Symmetric 256-bit encryption
RSA public-key SHA-2 algorithm (supports hash functions: 256, 384, 512)
ECC public-key cryptography (supports hash functions: 256 and 384)
Unlimited server licensing
Supports 2048-bit public key encryption (3072-bit and 4096-bit available)
Still not sure which one? Try CertWizard
Why Choose DigiCert?
Award-Winning Customer Support
Our experts are available 24 hours a day, 7 days a week, so you won't wait for issuance or for help at any stage of certificate management.
Cost and Convenience
Many Certificate Authorities only allow free reissues up to 30 days after purchase. DigiCert allows free reissues on unlimited servers for the life of your certificate.
Universal Device and Browser Compatibility
Thanks to one of the oldest root certificates in the industry, DigiCert SSL certificates are trusted by all major browsers, mail systems, operating systems, and mobile devices.
Fastest Issuance and Load Times
Our validation experts issue your certificate within a few hours and DigiCert OCSP times are up to 8x faster than competitors, making for the fastest SSL in the industry.
Strongest Encryption
DigiCert certificates feature 256-bit encryption, 2048-bit RSA keys signed with SHA-256. We also offer Elliptic Curve Cryptography (ECC) support.
Access to Free Tools and Platforms
Through CertCentral, we offer free tools to simplify and automate CSR generation, certificate installation, and certificate management.
Pioneering Certificate Authority
DigiCert was a founding member of the CA/Browser Forum, and is one of the few Certificate Authorities developing new SSL technology to better protect customers.
Improved SEO and Google Ranking
HTTPS is one of the most powerful ranking factors for organic search, so our SSL certificates will help boost your rankings and overall visibility.
Increased Conversions with Site Seal
Users trust sites that have a website seal clearly on display. One study revealed that over 60% of customers said they abandoned a purchase because a trust logo was missing.
Trusted by Top Companies in Every Industry
See what some of our customers are saying.
★★★★★ 4.9 (3685)
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Great service
Great service
Kara was very helpful and provided fast replies and clear instructions on what I needed to provide.
Fantastic Service!
I renewed my digicert certificate but since my address is in Japanese, I was worried if anybody could really verify my address and phone number.
There are Japanese speakers, who spoke to me on the phone, and verified my street address with my water bill written in Japanese.
It was very fast and the support is very good.
There are Japanese speakers, who spoke to me on the phone, and verified my street address with my water bill written in Japanese.
It was very fast and the support is very good.
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