# ``twisted`.`conch`.`ssh`.`_kex`.`_ECDH256``

class documentation

`class _ECDH256: (source)`

Implements interfaces: `twisted.conch.ssh._kex._IEllipticCurveExchangeKexAlgorithm`

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Elliptic Curve Key Exchange with SHA-256 as HASH. Defined in RFC 5656.

Note that `ecdh-sha2-nistp256` takes priority over nistp384 or nistp512. This is the same priority from OpenSSH.

`ecdh-sha2-nistp256` is considered preety good cryptography. If you need something better consider using `curve25519-sha256`.

Class Variable | `preference` | An `int` giving the preference of the algorithm when negotiating key exchange. Algorithms with lower precedence values are more preferred.

preference: `int` = (source)
from `twisted.conch.ssh._kex._IKexAlgorithm`
An `int` giving the preference of the algorithm when negotiating key exchange. Algorithms with lower precedence values are more preferred.