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Handshake Response Packet

Handshake Response Diagram

📦 Size​

21 bytes

  • TYPE: 8 bits
  • T. NONCE: 32 bits (transformed client nonce)
  • SUM OF NUMBERS: 64 bits
  • XOR OF NUMBERS: 64 bits

📤 Sent By​

Client, in response to a HandshakeRequest from the server.

🧪 Contents​

  • A transformed version of the original client nonce, XOR’ed with parts of the sum and XOR of the numbers sent by the client
  • The sum and XOR of the challenge numbers the client sent earlier

Only the TYPE field (0x03) is unencrypted.
The rest of the packet is encrypted with the shared handshake key.

🔒 Purpose​

This packet is sent by the client in response to the server's challenge.

It proves that the client possesses the correct handshake key
by demonstrating knowledge of the original challenge values (nonce, number1, number2),
which were encrypted using the shared key.

If the server cannot verify this packet correctly, the handshake fails.