change OFB iv to nonce to reflect dstufft nomenclature pitch
* Namely, we should try to call things IV if reuse leaks a small amount
of data and nonce if reuse can result in a complete break. This can
be somewhat ambiguous, but we'll track in #58
diff --git a/docs/primitives/symmetric-encryption.rst b/docs/primitives/symmetric-encryption.rst
index 7ec42a3..587c94b 100644
--- a/docs/primitives/symmetric-encryption.rst
+++ b/docs/primitives/symmetric-encryption.rst
@@ -68,18 +68,16 @@
reuse an ``initialization_vector`` with
a given ``key``.
-.. class:: cryptography.primitives.block.modes.OFB(initialization_vector)
+.. class:: cryptography.primitives.block.modes.OFB(nonce)
OFB (Output Feedback) is a mode of operation for block ciphers. It
transforms a block cipher into a stream cipher.
- :param bytes initialization_vector: Must be random bytes. They do not need
- to be kept secret (they can be included
- in a transmitted message). Must be the
- same number of bytes as the
- ``block_size`` of the cipher. Do not
- reuse an ``initialization_vector`` with
- a given ``key``.
+ :param bytes nonce: Must be random bytes. They do not need to be kept
+ secret (they can be included in a transmitted message).
+ Must be the same number of bytes as the ``block_size``
+ of the cipher. Reuse of a ``nonce`` with a given
+ ``key`` can allow recovery of the original plaintext.
Insecure Modes