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Diffstat (limited to 'docs')
| -rw-r--r-- | docs/primitives/symmetric-encryption.rst | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/docs/primitives/symmetric-encryption.rst b/docs/primitives/symmetric-encryption.rst index 7899e67d..96bd68f0 100644 --- a/docs/primitives/symmetric-encryption.rst +++ b/docs/primitives/symmetric-encryption.rst @@ -61,6 +61,23 @@ Ciphers This must be kept secret. +.. class:: cryptography.primitives.block.ciphers.TripleDES(key) + + Triple DES (Data Encryption Standard), sometimes refered to as 3DES, is a + block cipher standardized by NIST. Triple DES has known cryptoanalytic + flaws, however none of them currently enable a practical attack. + Nonetheless, Triples DES is not reccomended for new applications because it + is incredibly slow; old applications should consider moving away from it. + + :param bytes key: The secret key, either ``64``, ``128``, or ``192`` bits + (note that DES functionally uses ``56``, ``112``, or + ``168`` bits of the key, there is a parity byte in each + component of the key), in some materials these are + referred to as being up to three separate keys (each + ``56`` bits long), they can simply be concatenated to + produce the full key. This must be kept secret. + + Modes ~~~~~ |