To effectively fight against data espionage and interception, SSL/TLS certificates are the solution because they make it impossible to hack the information exchanged between the server and the browser.
An SSL (Secure Socket Layer) or TLS (Transport Layer Security) certificate is a digital certificate that authenticates a server (most often a web server) and encrypts the data exchanged with it. The data is thus exchanged in confidence, between two actors whose identity is known. The data exchanged cannot be spied on or altered by a third party: confidentiality and integrity.
SSL/TLS certificates allow to switch to HTTPS when browsing the Web. They work on the principle of asymmetric encryption using cryptographic keys. The SSL/TLS protocol activates a secure session between a browser and the web server that hosts the SSL certificate.