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-rw-r--r--docs/hazmat/primitives/cryptographic-hashes.rst5
1 files changed, 4 insertions, 1 deletions
diff --git a/docs/hazmat/primitives/cryptographic-hashes.rst b/docs/hazmat/primitives/cryptographic-hashes.rst
index b0e9c16a..fd5f35d9 100644
--- a/docs/hazmat/primitives/cryptographic-hashes.rst
+++ b/docs/hazmat/primitives/cryptographic-hashes.rst
@@ -120,7 +120,9 @@ SHA-2 family
BLAKE2
~~~~~~
-`BLAKE2`_ is a cryptographic hash function specified in :rfc:`7693`.
+`BLAKE2`_ is a cryptographic hash function specified in :rfc:`7693`. BLAKE2's
+design makes it immune to `length-extension attacks`_, an advantage over the
+SHA-family of hashes.
.. note::
@@ -224,3 +226,4 @@ Interfaces
.. _`Lifetimes of cryptographic hash functions`: http://valerieaurora.org/hash.html
.. _`BLAKE2`: https://blake2.net
+.. _`length-extension attacks`: https://en.wikipedia.org/wiki/Length_extension_attack