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Let’s Encrypt SSL Certificate

Let’s Encrypt is a free, automated, and open certificate authority (CA), run for the public’s benefit. It is a service provided by the Internet Security Research Group (ISRG). We give people the digital certificates they need in order to enable HTTPS (SSL/TLS) for websites, for free, in the most user-friendly way we can. We do this because we want to create a more secure and privacy-respecting Web.

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Let’s Encrypt SSL Certificate

Let’s Encrypt identifies the server administrator by public key. The first time the agent software interacts with Let’s Encrypt, it generates a new key pair and proves to the Let’s Encrypt CA that the server controls one or more domains. This is similar to the traditional CA process of creating an account and adding domains to that account. To kick off the process, the agent asks the Let’s Encrypt CA what it needs to do in order to prove that it controls example.com. The Let’s Encrypt CA will look at the domain name being requested and issue one or more sets of challenges. These are different ways that the agent can prove control of the domain.

Issuance and Revocation

 

 
  • Once the agent has an authorized key pair, requesting, renewing, and revoking certificates is simple—just send certificate management messages and sign them with the authorized key pair. To obtain a certificate for the domain, the agent constructs a PKCS#10 Certificate Signing Request that asks the Let’s Encrypt CA to issue a certificate for example.com with a specified public key. As usual, the CSR includes a signature by the private key corresponding to the public key in the CSR. The agent also signs the whole CSR with the authorized key for example.com so that the Let’s Encrypt CA knows it’s authorized.

Let’s Encrypt

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FREE
  • Single Domain Validation
  • ECDSA Signing Support
  • ACME DNS Challenge Support
  • Instant Issuance
  • Full IPv6 Support
  • FREE Renewal
  • Automatic Renewal
Get FREE SSL Certificate

Domain Validation

 

 
  • Let’s Encrypt identifies the server administrator by public key. The first time the agent software interacts with Let’s Encrypt, it generates a new key pair and proves to the Let’s Encrypt CA that the server controls one or more domains. This is similar to the traditional CA process of creating an account and adding domains to that account. To kick off the process, the agent asks the Let’s Encrypt CA what it needs to do in order to prove that it controls example.com. The Let’s Encrypt CA will look at the domain name being requested and issue one or more sets of challenges. These are different ways that the agent can prove control of the domain.

  • What is an SSL Certificate?

  • An SSL Certificate is a digital certificate issued for a domain by a central authority called the Certificate Authority. To be issued an SSL Certificate, you must purchase an SSL Certificate and then go through a verification process conducted by the Certificate Authority.

  • Why should I install an SSL Certificate?

  • An SSL Certificate does 2 things:
    1) Encrypt the information sent from your user's browser to your website.
    2) Authenticate your website's identity.
  • By doing these 2 things, an SSL Certificate protects your customers and in turn increases their trust in your online business. This is especially important if your website requires users to login using passwords or enter sensitive information such as credit card details.

  • Do SSL Certificates work in all browsers?

  • SSL Certificates are compatible with all major browsers.

  • What does it cost to use Let’s Encrypt? Is it really free?

  • We do not charge a fee for our certificates. Let’s Encrypt is a nonprofit, our mission is to create a more secure and privacy-respecting Web by promoting the widespread adoption of HTTPS. Our services are free and easy to use so that every website can deploy HTTPS.

  • Do I need technical expertise to set up an SSL Certificate on my website?

  • While it isn't difficult to install an SSL Certificate, it does involve following a series of steps. You can find more information in our KnowledgeBase.

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