diff --git a/django/contrib/formtools/tests.py b/django/contrib/formtools/tests.py
index 5263e6e598..8cfa08303b 100644
--- a/django/contrib/formtools/tests.py
+++ b/django/contrib/formtools/tests.py
@@ -1,5 +1,6 @@
+import unittest
 from django import forms
-from django.contrib.formtools import preview, wizard
+from django.contrib.formtools import preview, wizard, utils
 from django import http
 from django.test import TestCase
 
@@ -101,6 +102,24 @@ class PreviewTests(TestCase):
         response = self.client.post('/test1/', self.test_data)
         self.assertEqual(response.content, success_string)
 
+class SecurityHashTests(unittest.TestCase):
+
+    def test_textfield_hash(self):
+        """
+        Regression test for #10034: the hash generation function should ignore
+        leading/trailing whitespace so as to be friendly to broken browsers that
+        submit it (usually in textareas).
+        """
+        class TestForm(forms.Form):
+            name = forms.CharField()
+            bio = forms.CharField()
+        
+        f1 = TestForm({'name': 'joe', 'bio': 'Nothing notable.'})
+        f2 = TestForm({'name': '  joe', 'bio': 'Nothing notable.  '})
+        hash1 = utils.security_hash(None, f1)
+        hash2 = utils.security_hash(None, f2)
+        self.assertEqual(hash1, hash2)
+
 #
 # FormWizard tests
 #
diff --git a/django/contrib/formtools/utils.py b/django/contrib/formtools/utils.py
index a357255522..5be8b21928 100644
--- a/django/contrib/formtools/utils.py
+++ b/django/contrib/formtools/utils.py
@@ -16,7 +16,12 @@ def security_hash(request, form, *args):
     hash of that.
     """
 
-    data = [(bf.name, bf.field.clean(bf.data) or '') for bf in form]
+    data = []
+    for bf in form:
+        value = bf.field.clean(bf.data) or ''
+        if isinstance(value, basestring):
+            value = value.strip()
+        data.append((bf.name, value))
     data.extend(args)
     data.append(settings.SECRET_KEY)