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+* AEAD encrypted cookies and sessions with GCM
+
+ Encrypted cookies now use AES-GCM which couples authentication and
+ encryption in one faster step and produces shorter ciphertexts. Cookies
+ encrypted using AES in CBC HMAC mode will be seamlessly upgraded when
+ this new mode is enabled via the
+ `action_dispatch.use_authenticated_cookie_encryption` configuration value.
+
+ *Michael J Coyne*
+
* Change the cache key format for fragments to make it easier to debug key churn. The new format is:
views/template/action.html.erb:7a1156131a6928cb0026877f8b749ac9/projects/123