When we combine TCP Fast Open and TLS False Start, the key negotiation is performed simultaneously with the initial TCP handshake. When TCP Fast Open is enabled, data can be sent before the connection complete, and the responses will arrive immediately. If the server recognizes the data as valid, it will accept the data and pass them to the application. For the subsequent connections, the client copies the cookie in the TCP SYN message, and then sends data immediately. The RFC defines a new TCP option, containing a “Fast Open Cookie.” When a “Fast Open capable” client connects to a server for the first time, it inserts an empty cookie in the initial TCP SYN message, prompting the server to send back a valid cookie in the response. The next improvement comes from the TCP Fast Open procedure, defined in RFC 7413. We have already enabled TLS False Start in Microsoft Edge, with a set of strong cipher suites. With that, we are down to 1-RTT for TLS, or 2-RTT if we count the TCP connection. The first improvement comes from the TLS False Start option, which allows the client to start sending encrypted data immediately after the first TLS roundtrip. TCP Fast Open, TLS False Start, and TLS 1.3 can improve both performance and security in Microsoft Edge. It is designed for Windows 10 to be faster, safer, and compatible with the modern Web.
Microsoft Edge is a new web browser that is available across the Windows 10 device family.
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