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| author | Paul Kehrer <paul.l.kehrer@gmail.com> | 2013-12-21 18:53:19 -0600 |
|---|---|---|
| committer | Paul Kehrer <paul.l.kehrer@gmail.com> | 2013-12-21 18:53:19 -0600 |
| commit | 048d6cb43a0757f3b4cca385e788d30173ebcb17 (patch) | |
| tree | e0674a1a5af226ce1f1c5ddff17797a906d50712 /docs/hazmat/primitives/symmetric-encryption.rst | |
| parent | fc73e2d04315e21011869fbd925df9e7a99d21ae (diff) | |
| download | cryptography-048d6cb43a0757f3b4cca385e788d30173ebcb17.tar.gz cryptography-048d6cb43a0757f3b4cca385e788d30173ebcb17.tar.bz2 cryptography-048d6cb43a0757f3b4cca385e788d30173ebcb17.zip | |
a few more doc changes to gcm tag info
Diffstat (limited to 'docs/hazmat/primitives/symmetric-encryption.rst')
| -rw-r--r-- | docs/hazmat/primitives/symmetric-encryption.rst | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/docs/hazmat/primitives/symmetric-encryption.rst b/docs/hazmat/primitives/symmetric-encryption.rst index f009bb78..6e3c1024 100644 --- a/docs/hazmat/primitives/symmetric-encryption.rst +++ b/docs/hazmat/primitives/symmetric-encryption.rst @@ -357,9 +357,10 @@ Modes Cryptography will emit a 128-bit tag when finalizing encryption. You can shorten a tag by truncating it to the desired length, but this is **not recommended** as it lowers the security margins of the - authentication (`NIST SP-800-38D`_ recommends 96-bit or greater). + authentication (`NIST SP-800-38D`_ recommends 96-bits or greater). If you must shorten the tag the minimum allowed length is 4 bytes - (32 bit). + (32-bits). Applications **must** verify the tag is the expected length + to guarantee the expected security margin. :param bytes tag: The tag bytes to verify during decryption. When encrypting this must be None. |