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-rw-r--r--docs/hazmat/primitives/asymmetric/ec.rst5
1 files changed, 5 insertions, 0 deletions
diff --git a/docs/hazmat/primitives/asymmetric/ec.rst b/docs/hazmat/primitives/asymmetric/ec.rst
index e4df9b10..2fac6d71 100644
--- a/docs/hazmat/primitives/asymmetric/ec.rst
+++ b/docs/hazmat/primitives/asymmetric/ec.rst
@@ -147,6 +147,10 @@ Elliptic Curve Key Exchange algorithm
... ).public_key()
>>> shared_key = private_key.exchange(ec.ECDH(), peer_public_key)
+ ECDHE (or EECDH), the ephemeral form of this exchange, is **strongly
+ preferred** over simple ECDH and provides `forward secrecy`_ when used.
+ You must generate a new private key using :func:`generate_private_key` for
+ each ``exchange`` when performing an ECDHE key exchange.
Elliptic Curves
---------------
@@ -470,3 +474,4 @@ Key Interfaces
.. _`SafeCurves`: http://safecurves.cr.yp.to/
.. _`ECDSA`: https://en.wikipedia.org/wiki/ECDSA
.. _`EdDSA`: https://en.wikipedia.org/wiki/EdDSA
+.. _`forward secrecy`: https://en.wikipedia.org/wiki/Forward_secrecy