diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java b/packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
index 8102fae28aaf6..c459da9fb9a3d 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
@@ -1047,24 +1047,42 @@ public abstract class BaseStatusBar extends SystemUI implements
         row.findViewById(R.id.done).setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                guts.saveImportance(sbn);
-
-                int[] rowLocation = new int[2];
-                int[] doneLocation = new int[2];
-                row.getLocationOnScreen(rowLocation);
-                v.getLocationOnScreen(doneLocation);
-
-                final int centerX = v.getWidth() / 2;
-                final int centerY = v.getHeight() / 2;
-                final int x = doneLocation[0] - rowLocation[0] + centerX;
-                final int y = doneLocation[1] - rowLocation[1] + centerY;
-                dismissPopups(x, y);
+                // If the user has security enabled, show challenge if the setting is changed.
+                if (guts.hasImportanceChanged() && isLockscreenPublicMode() &&
+                        (mState == StatusBarState.KEYGUARD
+                        || mState == StatusBarState.SHADE_LOCKED)) {
+                    OnDismissAction dismissAction = new OnDismissAction() {
+                        @Override
+                        public boolean onDismiss() {
+                            saveImportanceCloseControls(sbn, row, guts, v);
+                            return true;
+                        }
+                    };
+                    onLockedNotificationImportanceChange(dismissAction);
+                } else {
+                    saveImportanceCloseControls(sbn, row, guts, v);
+                }
             }
         });
-
         guts.bindImportance(pmUser, sbn, row, mNotificationData.getImportance(sbn.getKey()));
     }
 
+    private void saveImportanceCloseControls(StatusBarNotification sbn,
+            ExpandableNotificationRow row, NotificationGuts guts, View done) {
+        guts.saveImportance(sbn);
+
+        int[] rowLocation = new int[2];
+        int[] doneLocation = new int[2];
+        row.getLocationOnScreen(rowLocation);
+        done.getLocationOnScreen(doneLocation);
+
+        final int centerX = done.getWidth() / 2;
+        final int centerY = done.getHeight() / 2;
+        final int x = doneLocation[0] - rowLocation[0] + centerX;
+        final int y = doneLocation[1] - rowLocation[1] + centerY;
+        dismissPopups(x, y);
+    }
+
     protected SwipeHelper.LongPressListener getNotificationLongClicker() {
         return new SwipeHelper.LongPressListener() {
             @Override
@@ -1450,6 +1468,8 @@ public abstract class BaseStatusBar extends SystemUI implements
         }
     }
 
+    protected void onLockedNotificationImportanceChange(OnDismissAction dismissAction) {}
+
     protected void onLockedRemoteInput(ExpandableNotificationRow row, View clickedView) {}
 
     @Override
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/NotificationGuts.java b/packages/SystemUI/src/com/android/systemui/statusbar/NotificationGuts.java
index 45a24a0b38224..3e0542f97e480 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/NotificationGuts.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/NotificationGuts.java
@@ -130,30 +130,23 @@ public class NotificationGuts extends LinearLayout implements TunerService.Tunab
             importanceSlider.setVisibility(View.VISIBLE);
             importanceButtons.setVisibility(View.GONE);
         } else {
-            int userImportance = NotificationListenerService.Ranking.IMPORTANCE_UNSPECIFIED;
+            mStartingImportance = NotificationListenerService.Ranking.IMPORTANCE_UNSPECIFIED;
             try {
-                userImportance =
+                mStartingImportance =
                         mINotificationManager.getImportance(sbn.getPackageName(), sbn.getUid());
             } catch (RemoteException e) {}
-            bindToggles(importanceButtons, userImportance, systemApp);
+            bindToggles(importanceButtons, mStartingImportance, systemApp);
             importanceButtons.setVisibility(View.VISIBLE);
             importanceSlider.setVisibility(View.GONE);
         }
     }
 
+    public boolean hasImportanceChanged() {
+        return mStartingImportance != getSelectedImportance();
+    }
+
     void saveImportance(final StatusBarNotification sbn) {
-        int progress;
-        if (mSeekBar!= null && mSeekBar.isShown()) {
-            progress = mSeekBar.getProgress();
-        } else {
-            if (mBlock.isChecked()) {
-                progress = NotificationListenerService.Ranking.IMPORTANCE_NONE;
-            } else if (mSilent.isChecked()) {
-                progress = NotificationListenerService.Ranking.IMPORTANCE_LOW;
-            } else {
-                progress = NotificationListenerService.Ranking.IMPORTANCE_UNSPECIFIED;
-            }
-        }
+        int progress = getSelectedImportance();
         MetricsLogger.action(mContext, MetricsEvent.ACTION_SAVE_IMPORTANCE,
                 progress - mStartingImportance);
         try {
@@ -163,6 +156,20 @@ public class NotificationGuts extends LinearLayout implements TunerService.Tunab
         }
     }
 
+    private int getSelectedImportance() {
+        if (mSeekBar!= null && mSeekBar.isShown()) {
+            return mSeekBar.getProgress();
+        } else {
+            if (mBlock.isChecked()) {
+                return NotificationListenerService.Ranking.IMPORTANCE_NONE;
+            } else if (mSilent.isChecked()) {
+                return NotificationListenerService.Ranking.IMPORTANCE_LOW;
+            } else {
+                return NotificationListenerService.Ranking.IMPORTANCE_UNSPECIFIED;
+            }
+        }
+    }
+
     private void bindToggles(final View importanceButtons, final int importance,
             final boolean systemApp) {
         mBlock = (RadioButton) importanceButtons.findViewById(R.id.block_importance);
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
index 32a6f161cfdf9..bf58592c7ca9b 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java
@@ -4196,6 +4196,12 @@ public class PhoneStatusBar extends BaseStatusBar implements DemoMode,
         }
     }
 
+    @Override
+    public void onLockedNotificationImportanceChange(OnDismissAction dismissAction) {
+        mLeaveOpenOnKeyguardHide = true;
+        dismissKeyguardThenExecute(dismissAction, true /* afterKeyguardGone */);
+    }
+
     @Override
     protected void onLockedRemoteInput(ExpandableNotificationRow row, View clicked) {
         mLeaveOpenOnKeyguardHide = true;