, formerly known as , is a used by applications to communicate securely across a network, preventing tampering with and eavesdropping on email, web browsing, messaging, and other protocols. Both SSL and TLS are client / server protocols that ensure communication privacy by using cryptographic protocols to provide security over a network. When a server and client communicate using TLS, it ensures that no third party can eavesdrop or tamper with any message. Transport Layer Security (TLS) Secure Sockets Layer (SSL) protocol All modern browsers support the TLS protocol, requiring the server to provide a valid confirming its identity in order to establish a secure connection. It is possible for both the client and server to mutually authenticate each other, if both parties provide their own individual digital certificates. digital certificate : TLS 1.0 and 1.1 support will be removed from all major browsers in early 2020; you'll need to make sure your web server supports TLS 1.2 or 1.3 going forward. From version 74 onwards, Firefox will return a error when connecting to servers using the older TLS versions ( ). Note Secure Connection Failed bug 1606734 View Previous Terms: Block cipher mode of operation Certificate authority Challenge-response authentication Cipher Cipher suite Ciphertext CORS CORS-safelisted request header CORS-safelisted response header Cross-site scripting Cryptanalysis Cryptographic hash function Cryptography CSP CSRF Decryption Digital certificate DTLS (Datagram Transport Layer Security) Encryption Forbidden header name Forbidden response header name Hash HMAC HPKP HSTS HTTPS Key MitM OWASP Preflight request Public-key cryptography Reporting directive Robots.txt Same-origin policy Session Hijacking SQL Injection Symmetric-key cryptography TOFU Credits Source: https://developer.mozilla.org/en-US/docs/Glossary/TLS Published under license Open CC Attribution ShareAlike 3.0