A padlock and an HTTPS prefix on the web browser address bar indicates an SSL (Secure Sockets Layer) certificate is installed for the web application. SSL certificates on a web server are essential for protecting online data transmission.
When a user visits your web application, the SSL certificate enables an encrypted connection, protecting sensitive information transmitted between the browser and the server. SSL certificates also establishes trust with users by providing identification of your application. Validation types include Domain Validation (DV), Organisation Validation (OV) and Extended Validation (EV).
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DV SSL certificates can be used for personal sites, blogs and simple websites. E-Commerce sites with login and payment requires at least OV validation which validates the organisation of the site owner. EV SSL certificates are crucial for applications that require a high level of trust, such as public sites and financial sites and applications. EV certificates are issued only upon stringent verification of the organisation.
This is useful for server reinstallation, application re-deployments and migration to another server.
Depending on the capabilities of the web browser and server, the SSL certificates use either 256-bit or 128-bit encryption.