Conclusion

Purpose: Summarize project outcomes, learning impact, and practical next steps.

The project successfully demonstrates Diffie-Hellman key exchange in Java and verifies that both participants compute the same secret key before encrypted communication.

What Was Achieved

• Implemented complete DH key establishment flow with clear class responsibilities.
• Added input validation for \( q \), \( \alpha \), private-key ranges, and message length.
• Verified end-to-end encryption/decryption consistency using the shared secret.
• Produced report and test evidence aligned with course expectations.

What Was Learned

• How discrete mathematics directly drives public-key protocol behavior.
• Why validation and controlled input flow are critical in cryptographic software.
• Why DH alone is insufficient without an authentication layer.

Limitations and Future Work

• Add authenticated key exchange support (for example, signature-backed identity checks).
• Improve parameter generation defaults (safe-prime and generator policies).
• Add an ECDH path for modern performance/security comparison.
• Expand automated tests, including larger parameter scenarios.

Overall, the project meets the CS285 learning objective of turning theory into a reproducible cryptographic implementation.