![]() ![]() The negotiation needed to complete before the secure session could be established and encrypted application data transmitted. In TLS 1.2, this process took several back-and-forth packets between the client and server - each back-and-forth is generally referred to as a “round-trip”. This negotiation is called a “handshake”. TLS involves a negotiation process between the client and the server to choose the appropriate cipher suites to be used and other settings. When analyzing TLS captures, you'll notice that the frame decode window still contains the protocol fields under "secure socket layer", or SSL, so don't be confused when expanding these frames in the examples. ![]() We took these captures using OpenSSL version 1.1.1-pre8 and the built in s_server and s_client applications. CloudShark 3.5 and later versions have support for TLS 1.3 decodes as a result. We're able to look at TLS 1.3 handshakes thanks to support for the protocol in tshark 2.6. ![]() TLS 1.3 is defined in IETF RFC 8446, and has a great overview of the changes from TLS 1.2. As the number of networked applications has increased, the drive to make TLS more efficient gained momentum, and TLS 1.3 was released. Version 1.2 was defined in RFC 5246 as an evolution to Secure Socket Layer (SSL) and has been in use for a long time. ![]() TLS itself was originally defined in IETF RFC 2246 (version 1.0). TLS uses the Public Key Infrastructure (PKI) to provide authentication and includes a process both client and server can use to agree on an encryption mechanism. Security is generally comprised of several component concepts, including authentication, authorization, and encryption. If you’re not familiar with TLS, it’s the protocol that allows applications to communicate data securely between two points. Here's a quick overview of the benefits, with real packet capture examples. Released in 2018, it will still take awhile for most application to migrate towards using it. Transport Layer Security (TLS) version 1.3 has some rather important improvements over TLS 1.2. ![]()
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