Which is the first step in a key exchange?

The initial phase in a key exchange commences with the web browser initiating a connection by dispatching a "ClientHello" message to the server. This preliminary message serves as a handshake signal, indicating the commencement of a secure communication process.

Subsequent to the transmission of the "ClientHello" message, the web browser engages in a vital security check. It meticulously verifies the authenticity and validity of the server's certificate. This verification process ensures that the server is who it claims to be, thereby safeguarding against potential man-in-the-middle attacks or other forms of impersonation.

Once the server's certificate has been successfully validated, the server responds with its own "ServerHello" message, acknowledging the receipt of the client's initial greeting. This exchange of greetings serves as a foundational step in establishing a mutually agreed-upon cipher suite and protocol version for the upcoming secure communication.

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