HTTPS some links, in the odd event users of a cryptographic library would care about authentication, integrity, or confidentiality
diff --git a/docs/hazmat/primitives/symmetric-encryption.rst b/docs/hazmat/primitives/symmetric-encryption.rst
index d588489..7b00d11 100644
--- a/docs/hazmat/primitives/symmetric-encryption.rst
+++ b/docs/hazmat/primitives/symmetric-encryption.rst
@@ -610,7 +610,7 @@
.. _`NIST SP-800-38D`: http://csrc.nist.gov/publications/nistpubs/800-38D/SP-800-38D.pdf
.. _`Communications Security Establishment`: https://www.cse-cst.gc.ca
.. _`encrypt`: https://ssd.eff.org/en/module/what-encryption
-.. _`CRYPTREC`: http://www.cryptrec.go.jp/english/
+.. _`CRYPTREC`: https://www.cryptrec.go.jp/english/
.. _`significant patterns in the output`: https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Electronic_Codebook_.28ECB.29
.. _`International Data Encryption Algorithm`: https://en.wikipedia.org/wiki/International_Data_Encryption_Algorithm
.. _`OpenPGP`: http://www.openpgp.org