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authorMatthew Hodgson <matthew@matrix.org>2018-03-19 09:27:36 +0000
committerMatthew Hodgson <matthew@matrix.org>2018-03-19 09:27:36 +0000
commit38f952b9bc96cf72d96bab3510e8f428a8247542 (patch)
tree8a06cfd2c05cb9c33b0163b8df9297da557d445e /synapse
parentReplace some ujson with simplejson to make it work (diff)
downloadsynapse-38f952b9bc96cf72d96bab3510e8f428a8247542.tar.xz
spell out not to massively increase bcrypt rounds
Diffstat (limited to '')
-rw-r--r--synapse/config/registration.py4
1 files changed, 3 insertions, 1 deletions
diff --git a/synapse/config/registration.py b/synapse/config/registration.py
index 336959094b..c5384b3ad4 100644
--- a/synapse/config/registration.py
+++ b/synapse/config/registration.py
@@ -77,7 +77,9 @@ class RegistrationConfig(Config):
 
         # Set the number of bcrypt rounds used to generate password hash.
         # Larger numbers increase the work factor needed to generate the hash.
-        # The default number of rounds is 12.
+        # The default number is 12 (which equates to 2^12 rounds).
+        # N.B. that increasing this will exponentially increase the time required
+        # to register or login - e.g. 24 => 2^24 rounds which will take >20 mins.
         bcrypt_rounds: 12
 
         # Allows users to register as guests without a password/email/etc, and