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Diffie-Hellman Shared Secret Calculator

K = g^(ab) mod p — toy key exchange for small primes.

Computes a Diffie-Hellman shared secret from public generator g, prime p, and private keys a and b. For educational toy primes only.

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Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Public A = g^a mod p; B = g^b mod p; Shared K = B^a mod p

In depth

Computes a Diffie-Hellman shared secret from public generator g, prime p, and private keys a and b. For educational toy primes only.