SSL certificate (Secure Sockets Layer Certificate)

July 30, 2025
An SSL certificate is a digital certificate that provides authentication for a website and ensures an encrypted connection. The main function of an SSL certificate is to ensure secure data transmission between the client and the server via an encrypted channel. This is especially important when transmitting confidential information, such as bank card details and personal data.

How SSL certificates work

SSL certificates use cryptographic keys to establish an encrypted connection. The process involves the use of a public key, which encrypts information sent by users to the server, and a private key, which is used by the server to decrypt this data. When a connection is established between the browser and the server, a “handshake” process takes place, which confirms the authenticity of the SSL certificate before exchanging encrypted data.

The importance of SSL certificates for security

SSL certificates are critical for ensuring security on the Internet. They prevent third parties from intercepting and altering data, ensuring the confidentiality and integrity of the information being transmitted. In addition, SSL certificates influence user trust in a website, as browsers display a lock icon next to the URL to indicate a secure connection.

Types of SSL Certificates

There are various types of SSL certificates, including:

Domain Validated (DV) Certificates: Only verify ownership of the domain name.
Organization Validated (OV) Certificates: Require verification of company information.
Extended Validation (EV) certificates: Provide the highest level of verification and trust, requiring detailed verification of company information.

Issuing and managing SSL certificates

SSL certificates are issued by authorized certification authorities (CAs), which verify the website owner’s information before issuing them. Periodically updating and managing SSL certificates is an important part of maintaining website security and protecting user data.