[1.7.x] Increased the default PBKDF2 iterations.

django/contrib/auth/hashers.py

@@ -222,12 +222,12 @@ class PBKDF2PasswordHasher(BasePasswordHasher):
     """
     Secure password hashing using the PBKDF2 algorithm (recommended)
 
-    Configured to use PBKDF2 + HMAC + SHA256 with 12000 iterations.
+    Configured to use PBKDF2 + HMAC + SHA256 with 15000 iterations.
     The result is a 64 byte binary string.  Iterations may be changed
     safely but you must rename the algorithm if you change SHA256.
     """
     algorithm = "pbkdf2_sha256"
-    iterations = 12000
+    iterations = 15000
     digest = hashlib.sha256
 
     def encode(self, password, salt, iterations=None):

django/contrib/auth/tests/test_hashers.py

@@ -47,7 +47,7 @@ class TestUtilsHashPass(SimpleTestCase):
     def test_pkbdf2(self):
         encoded = make_password('lètmein', 'seasalt', 'pbkdf2_sha256')
         self.assertEqual(encoded,
-            'pbkdf2_sha256$12000$seasalt$Ybw8zsFxqja97tY/o6G+Fy1ksY4U/Hw3DRrGED6Up4s=')
+            'pbkdf2_sha256$15000$seasalt$+qoFTwR4r71UCLMhmQUCou/LMu17XwQWfYIVd/xJ1RI=')
         self.assertTrue(is_password_usable(encoded))
         self.assertTrue(check_password('lètmein', encoded))
         self.assertFalse(check_password('lètmeinz', encoded))
@@ -211,14 +211,14 @@ class TestUtilsHashPass(SimpleTestCase):
         hasher = PBKDF2PasswordHasher()
         encoded = hasher.encode('lètmein', 'seasalt2')
         self.assertEqual(encoded,
-            'pbkdf2_sha256$12000$seasalt2$hlDLKsxgkgb1aeOppkM5atCYw5rPzAjCNQZ4NYyUROw=')
+            'pbkdf2_sha256$15000$seasalt2$uSQqI+91wgObKdP6L6S75LLzyxrZRWNcaujEZPA3/nA=')
         self.assertTrue(hasher.verify('lètmein', encoded))
 
     def test_low_level_pbkdf2_sha1(self):
         hasher = PBKDF2SHA1PasswordHasher()
         encoded = hasher.encode('lètmein', 'seasalt2')
         self.assertEqual(encoded,
-            'pbkdf2_sha1$12000$seasalt2$JeMRVfjjgtWw3/HzlnlfqBnQ6CA=')
+            'pbkdf2_sha1$15000$seasalt2$iYDXAPKgMsKMsarvA1MErD518Ug=')
         self.assertTrue(hasher.verify('lètmein', encoded))
 
     def test_upgrade(self):

docs/releases/1.7.3.txt

@@ -11,4 +11,9 @@ Django 1.7.3 fixes several bugs in 1.7.2.
 Bugfixes
 ========
 
-* ...
+* The default iteration count for the PBKDF2 password hasher has been
+  increased by 25%. This part of the normal major release process was
+  inadvertently omitted in 1.7. This backwards compatible change will not
+  affect users who have subclassed
+  ``django.contrib.auth.hashers.PBKDF2PasswordHasher`` to change the
+  default value.