Diffie Hellman Private Key Generation

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PyDHE is an instructional implementation of the Diffie-Hellman key exchange protocol in Python.

DiffieHellman.py contains a functional implementation of the protocol, and SimpleDHE.py includes a simplified example of the protocol's steps.

Diffie-Hellman algorithm The Diffie-Hellman algorithm is being used to establish a shared secret that can be used for secret communications while exchanging data over a public network using the elliptic curve to generate points and get the secret key using the parameters. Jan 10, 2019  The first prime-number, security-key algorithm was named Diffie-Hellman algorithm and patented in 1977. The Diffie-Hellman algorithm is non-authenticated protocol, but does require the sharing of a “secret” key between the two communicating parties. Key pairs include the generation of the public key and the private key. Because of this.


PyDHE is provided as a demonstration of the Diffie-Hellman key exchange protocol. Per the GPL, it is provided without any warranty or implication of fitness for a purpose.

WARNING: The code in this project is for instructional purposes only. No matter how smart you might think you are, it's unwise to use homebrew encryption code in sensitive or production environments.

If you need real security, use an established, audited and thoroughly tested encryption package like PolarSSL, GNUTLS or NaCl. Many established encryption libraries include python bindings.


The following code performs a complete exchange, including key generation using SHA-256:

Specifying your own parameters

To specify a different generator, prime group or private key size, specify them when calling DiffieHellman():

Diffie Hellman Keys

The class initializer does some basic sanity checks on supplied values.


The DiffieHellman class uses parameters recommended by RFC 3562 for generation of a 256-bit key. Check the spec for other key sizes and options.

Diffie Hellman Key Exchange Java


This program is free software: you can redistribute it and/or modifyit under the terms of the GNU General Public License as published bythe Free Software Foundation, either version 3 of the License, or(at your option) any later version.

This program is distributed in the hope that it will be useful,but WITHOUT ANY WARRANTY; without even the implied warranty ofMERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See theGNU General Public License for more details.

Advantages Of Private Key Encryption

You should have received a copy of the GNU General Public Licensealong with this program. If not, see http://www.gnu.org/licenses/.