Classic example with small numbers
prime = 23generator = 5privateA = 6privateB = 15
Result: Both compute shared secret = 2.
Diffie-Hellman Demo
<strong>⚠️ Educational Demonstration Only</strong> - This tool demonstrates the classic Diffie-Hellman key exchange algorithm for learning purposes. For production applications, use ECDH (Elliptic Curve Diffie-Hellman) which provides equivalent security with smaller keys and better performance. This tool uses small parameters for demonstration and is NOT suitable for real-world security.
Privacy: this tool processes your data entirely in your browser. Nothing you paste or type is sent to the server.
Enter your values and press Calculate — the result appears here.
Worked examples
Frequently asked questions
Why is this "educational only"?
This uses small prime numbers that can be factored easily. Real-world DH uses primes with hundreds of digits. Also, classic DH is vulnerable to man-in-the-middle attacks without authentication (like certificates).
How does DH prevent eavesdropping?
An eavesdropper sees g^a mod p and g^b mod p but cannot compute g^(ab) mod p without solving the discrete logarithm problem, which is computationally infeasible for large primes.
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