diff --git a/res/values/strings.xml b/res/values/strings.xml
index 0494e0458fd..a2a36995558 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -11086,10 +11086,10 @@
     <!-- Title for if toggle access is disabled by carrier [CHAR LIMIT=NONE] -->
     <string name="enable_2g_summary_disabled_carrier"><xliff:g id="carrier_name_2g" example="Google Fi">%1$s</xliff:g> requires 2G to be available</string>
 
-    <!-- Title for toggle if user wants to allow null cellular algorithms [CHAR LIMIT=40] -->
-    <string name="allow_null_algorithms_title">Allow less secure connection</string>
-    <!-- Summary for if the user wants to allow null cellular algorithms [CHAR LIMIT=NONE] -->
-    <string name="allow_null_algorithms_summary">May improve your signal in some locations. For emergency calls, less secure connections are always allowed.</string>
+    <!-- Title for toggle if user wants to require cellular encryption [CHAR LIMIT=40] -->
+    <string name="require_cellular_encryption_title">Require encryption</string>
+    <!-- Summary for if the user wants to require cellular encryption [CHAR LIMIT=NONE] -->
+    <string name="require_cellular_encryption_summary">Encryption is more secure, but you might not be able to connect in some locations. For emergency calls, encryption is never required</string>
 
     <!-- Label for All services preference in App info settings [CHAR LIMIT=40] -->
     <string name="app_info_all_services_label">All services</string>
diff --git a/res/xml/mobile_network_settings.xml b/res/xml/mobile_network_settings.xml
index 169356b9e03..3e3e545f59c 100644
--- a/res/xml/mobile_network_settings.xml
+++ b/res/xml/mobile_network_settings.xml
@@ -251,9 +251,9 @@
             settings:userRestriction="no_cellular_2g"/>
 
         <SwitchPreference
-            android:key="allow_null_algorithms"
-            android:title="@string/allow_null_algorithms_title"
-            android:summary="@string/allow_null_algorithms_summary"
+            android:key="require_cellular_encryption"
+            android:title="@string/require_cellular_encryption_title"
+            android:summary="@string/require_cellular_encryption_summary"
             settings:controller=
                 "com.android.settings.network.telephony.NullAlgorithmsPreferenceController" />
 
diff --git a/src/com/android/settings/network/telephony/NullAlgorithmsPreferenceController.java b/src/com/android/settings/network/telephony/NullAlgorithmsPreferenceController.java
index cfb5344bd54..be5b01ee83b 100644
--- a/src/com/android/settings/network/telephony/NullAlgorithmsPreferenceController.java
+++ b/src/com/android/settings/network/telephony/NullAlgorithmsPreferenceController.java
@@ -21,9 +21,9 @@ import android.telephony.TelephonyManager;
 import android.util.Log;
 
 /**
- * Preference controller for "Allow Null Algorithms"
+ * Preference controller for "Require Encryption"
  *
- * <p>This preference controller is toggling null algorithms is not a per-sim operation.
+ * <p>This preference controller is toggling null algorithms. This applies to all active SIMs.
  */
 public class NullAlgorithmsPreferenceController extends TelephonyTogglePreferenceController {
 
@@ -33,7 +33,7 @@ public class NullAlgorithmsPreferenceController extends TelephonyTogglePreferenc
     private TelephonyManager mTelephonyManager;
 
     /**
-     * Class constructor of "Allow Null Algorithms" toggle.
+     * Class constructor of "Require Encryption" toggle.
      *
      * @param context of settings
      * @param key     assigned within UI entry of XML file
@@ -81,7 +81,7 @@ public class NullAlgorithmsPreferenceController extends TelephonyTogglePreferenc
     }
 
     /**
-     * Return {@code true} if null algorithms are currently allowed.
+     * Return {@code true} if encryption is required (null algorithms not allowed)
      *
      * <p><b>NOTE:</b> This method returns the active state of the preference controller and is not
      * the parameter passed into {@link #setChecked(boolean)}, which is instead the requested future
@@ -90,7 +90,7 @@ public class NullAlgorithmsPreferenceController extends TelephonyTogglePreferenc
     @Override
     public boolean isChecked() {
         try {
-            return mTelephonyManager.isNullCipherAndIntegrityPreferenceEnabled();
+            return !mTelephonyManager.isNullCipherAndIntegrityPreferenceEnabled();
         } catch (Exception e) {
             Log.e(LOG_TAG,
                     "Failed isNullCipherAndIntegrityEnabled. Defaulting toggle to "
@@ -109,24 +109,22 @@ public class NullAlgorithmsPreferenceController extends TelephonyTogglePreferenc
      * details.
      *
      * @param isChecked The toggle value that we're being requested to enforce. A value of {@code
-     *                  false} denotes that null ciphers will be disabled by the modem after this
-     *                  function
-     *                  completes, if it is not already.
+     *                  true} denotes that null ciphers will be disabled by the modem after this
+     *                  function completes, if it is not already.
      */
     @Override
     public boolean setChecked(boolean isChecked) {
         if (isChecked) {
-            Log.i(LOG_TAG, "Enabling null algorithms");
+            Log.i(LOG_TAG, "Encryption required. Disabling null algorithms.");
         } else {
-            Log.i(LOG_TAG, "Disabling null algorithms");
+            Log.i(LOG_TAG, "Encryption not required. Enabling null algorithms.");
         }
         try {
-            mTelephonyManager.setNullCipherAndIntegrityEnabled(isChecked);
+            mTelephonyManager.setNullCipherAndIntegrityEnabled(!isChecked);
         } catch (Exception e) {
             Log.e(LOG_TAG,
                     "Failed setNullCipherAndIntegrityEnabled. Setting not updated. Exception: "
                             + e.getMessage());
-            // The underlying setting was not updated
             return false;
         }
         return true;
diff --git a/tests/unit/src/com/android/settings/network/telephony/NullAlgorithmsPreferenceControllerTest.java b/tests/unit/src/com/android/settings/network/telephony/NullAlgorithmsPreferenceControllerTest.java
index 99d0a43562f..87907e0d0a2 100644
--- a/tests/unit/src/com/android/settings/network/telephony/NullAlgorithmsPreferenceControllerTest.java
+++ b/tests/unit/src/com/android/settings/network/telephony/NullAlgorithmsPreferenceControllerTest.java
@@ -142,22 +142,22 @@ public final class NullAlgorithmsPreferenceControllerTest {
     }
 
     @Test
-    public void setChecked_true() {
+    public void setChecked_true_nullCiphersDisabled() {
         mController.setChecked(true);
-        verify(mTelephonyManager, times(1)).setNullCipherAndIntegrityEnabled(true);
+        verify(mTelephonyManager, times(1)).setNullCipherAndIntegrityEnabled(false);
     }
 
     @Test
-    public void setChecked_false() {
+    public void setChecked_false_nullCiphersEnabled() {
         mController.setChecked(false);
-        verify(mTelephonyManager, times(1)).setNullCipherAndIntegrityEnabled(false);
+        verify(mTelephonyManager, times(1)).setNullCipherAndIntegrityEnabled(true);
     }
 
     @Test
     public void setChecked_exceptionThrown() {
         doThrow(IllegalStateException.class).when(
                 mTelephonyManager).setNullCipherAndIntegrityEnabled(true);
-        assertFalse(mController.setChecked(true));
+        assertFalse(mController.setChecked(false));
         verify(mTelephonyManager, times(1)).setNullCipherAndIntegrityEnabled(true);
     }
 }