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Diffstat (limited to 'docs/primitives')
| -rw-r--r-- | docs/primitives/symmetric-encryption.rst | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/docs/primitives/symmetric-encryption.rst b/docs/primitives/symmetric-encryption.rst index f028c755..c4f78a79 100644 --- a/docs/primitives/symmetric-encryption.rst +++ b/docs/primitives/symmetric-encryption.rst @@ -68,6 +68,17 @@ Modes reuse an ``initialization_vector`` with a given ``key``. +.. 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 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 -------------- |