MAC, where the MAC key again is derived from the master secret.
(MAC)) and are also sent under the new Cipher Spec with its keyed With the new master secret (serving as a Message Authentication Code Handshake so far processed by a Pseudorandom Function (PRF) keyed These messages are based on a hash of the In a TLS handshake, the Finished messages serve to validate theĮntire handshake. TCP fast open will also reduce privacy for the server and client will store cookies that can be used to link former and subsequent connections ĥ. There is more info here from the IETF: (See section 5. This is because it does not allow the client to fully complete its handshake before starting the actual session. Performance yes, but TLS False start does not improve security, it does the opposite Firefox Hardening Guide 2018 There is just 1-RTT before the HTTP traffic starts.įor more information, see: Building a faster and more secure web with TCP Fast Open, TLS False Start, and TLS 1.3 | Microsoft Edge Dev Blog 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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