A TLS handshake involves multiple steps, as the client and server exchange the information necessary for completing the handshake and making further conversation possible. TLS handshakes are a series of datagrams, or messages, exchanged by a client and a server.
Generate session keys in order to use symmetric encryption after the handshake is complete. Authenticate the identity of the server via the server’s public key and the SSL certificate authority’s digital signature. Decide on which cipher suites (see below) they will use. Specify which version of TLS (TLS 1.0, 1.2, 1.3, etc.) they will use. What happens during a TLS handshake?ĭuring the course of a TLS handshake, the client and server together will do the following: TLS handshakes occur after a TCP connection has been opened via a TCP handshake. A TLS handshake also happens whenever any other communications use HTTPS, including API calls and DNS over HTTPS queries. When does a TLS handshake occur?Ī TLS handshake takes place whenever a user navigates to a website over HTTPS and the browser first begins to query the website's origin server. SSL handshakes are now called TLS handshakes, although the "SSL" name is still in wide use. SSL was replaced by TLS, or Transport Layer Security, some time ago. SSL, or Secure Sockets Layer, was the original security protocol developed for HTTP. TLS handshakes are a foundational part of how HTTPS works. During a TLS handshake, the two communicating sides exchange messages to acknowledge each other, verify each other, establish the cryptographic algorithms they will use, and agree on session keys. A TLS handshake is the process that kicks off a communication session that uses TLS. TLS is an encryption and authentication protocol designed to secure Internet communications. Secure endpoints for your remote workforce by deploying our client with your MDM vendorsĮnhance on-demand DDoS protection with unified network-layer security & observabilityĬonnect to Cloudflare using your existing WAN or SD-WAN infrastructure Get frictionless authentication across provider types with our identity partnershipsĮxtend your network to Cloudflare over secure, high-performing links Integrate device posture signals from endpoint security programs We work with partners to provide network, storage, & power for faster, safer delivery We partner with leading cyber insurers & incident response providers to reduce cyber risk We partner with an alliance of providers committed to reducing data transfer fees 
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