ECDH Shared Secret Generator

Compare Alice and Bob derived bits locally for P-256, P-384, or P-521 without transmitting private keys.

Curve

ReadyDemonstration only: a real protocol also needs authentication and a KDF.

Alice public key

Bob public key

Derived shared secret (hex)

All cryptographic operations run locally in your browser. Keep private keys secret and use production key-management practices for real systems.

How to use this ECDH Shared Secret Generator

Demonstrate elliptic-curve Diffie-Hellman by generating two local key pairs and deriving the same shared secret. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.