Derive shared secret
privateKeyA = {"kty":"EC","crv":"P-256","d":"..."}publicKeyB = {"kty":"EC","crv":"P-256","x":"...","y":"..."}
Result: Hex-encoded shared secret.
ECDH Key Agreement
Demonstrate ECDH key agreement: two parties exchange public keys and independently derive the same shared secret. Paste Alice's private key and Bob's public key (or vice versa).
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
How does ECDH work?
Alice generates a key pair (private key A, public key A). Bob generates a key pair (private key B, public key B). They exchange public keys. Alice computes SharedSecret = ECDH(privateKeyA, publicKeyB). Bob computes SharedSecret = ECDH(privateKeyB, publicKeyA). Both get the same result.
Is ECDH secure?
Yes, ECDH is secure under the Elliptic Curve Diffie-Hellman assumption. An eavesdropper who sees both public keys cannot compute the shared secret without solving the discrete logarithm problem.
What should I do with the shared secret?
The shared secret is typically used as input to a key derivation function (like HKDF) to derive encryption keys. Never use it directly as an encryption key.
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