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The significant changes in the negotiation phase (three-way handshake
phase) from the classical TCP are;
- Any SYN segments cannot include real data because the connection
is not securely established. T/TCP (Transaction TCP) in
RFC1644 promotes real data transmissions in the SYN segment for
performance reasons, however, this idea is conflicted with the Secure TCP.
- The cross-active open cannot be allowed. In the TCP protocol
specification, both peer entities can send the SYN segment simultaneously.
In this case, the peer entities merely return ACK segments,
and then the TCP connection is established.
This connection establishment is called ``cross-active open.''
However, this cross-active open does not exchange
encryption keys in secure manner in the Secure TCP.
Therefore, if the entity receives the SYN segment in the state ``SYN
SENT,'' the state is immediately moved to the state ``CLOSED''.
This state transmission avoids insecure cross-active open in the Secure
Sat Apr 29 04:12:04 GMT+0900 1995