Diffie-Hellman Key Exchange in Go

This project demonstrates a simple Diffie-Hellman key exchange implementation in Go, with a client and server communicating over TCP. The shared secret generated can be used for symmetric encryption.

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Project Structure

• client/main.go – Connects to the server, sends its public key, and computes the shared key.
• server/main.go – Listens on a TCP port, receives the client's public key, sends its own, and computes the shared key.

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How It Works

1. Both client and server generate a private key (random number modulo p).
2. They generate a public key:
   $publicKey = g^{privateKey} \mod p$
3. The client sends its public key to the server.
4. The server sends its public key back.
5. Both compute the shared secret: $sharedKey = (otherPartyPublicKey)^{privateKey} \mod p$
6. Both sides now have the same shared key without transmitting it directly.

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RFC MODP 2048

The code uses the RFC 3526 2048-bit MODP Group prime (p) and generator (g = 2) for key generation.

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Running the Project

1. Start the server:

go run ./server/main.go

2. Start the client:

go run ./client/main.go