We should use Diffie-Hellman based key exchange in P2P connections

[obiyankenobi]

For servers, it is desirable to offer Diffie-Hellman based key exchange that provides perfect forward secrecy. The ciphers are activated by default, however it is necessary to pass an instance of DiffieHellmanParameters to CertificateOptions via the dhParameters option to be able to use them.

https://twistedmatrix.com/documents/current/core/howto/ssl.html#tls-protocol-options