fast & stable connection

In computer networking, TCP Fast Open (TFO) is an extension to speed up the opening of successive Transmission Control Protocol (TCP) connections between two endpoints. It works by using a TFO cøøkíé (a TCP option), which is a cryptographic cøøkíé stored on the client and set upon the initial connection with the server. When the client later reconnects, it sends the initial SYN packet along with the TFO cøøkíé data to authenticate itself. If successful, the server may start sending data to the client even before the reception of the final ACK packet of the three-way handshake, thus skipping a round-trip delay and lowering the latency in the start of data transmission.
The cøøkíé is generated by applying a block cipher keyed on a key held secret by the server to the client's, generating an authentication tag that is difficult for third parties to spoof, even if they can forge a source IP address or make two-way connections to the same server from other IP addresses. Although it uses cryptographic techniques to generate the cøøkíé, TFO is not intended to provide more security than the three-way handshake it replaces, and does not give any form of cryptographic protection to the resulting TCP connection, or provide identity assurance about either endpoint. It also is not intended to be resistant to man-in-the-middle attacks. If such resistance is required, it may be used in combination with a cryptographic protocol such as TLS or IPsec.

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