In cryptographic handshakes, the negotiation of security methods and options occurs during which stage?

• A. First
• B. Second
• C. Third
• D. None of the Above

Answer: (A)

Negotiation of which cryptographic methods and options to use happens at the very start of the handshake. This early agreement is necessary so both sides know how the session will be protected before any data is exchanged. By choosing the cipher suite, key exchange method, MAC, and related options upfront, the protocol can derive compatible keys and establish a secure channel from the first moment data is sent. For example, TLS negotiates these choices in the initial ClientHello/ServerHello exchange, and SSH does so in the early algorithm negotiation phase. If decisions were deferred to later stages, secure communication could’t begin with a guaranteed, compatible set of cryptographic primitives.