diff --git a/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/ViewKeyMainFragment.java b/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/ViewKeyMainFragment.java
index 26c39b91d..00ca0d1f4 100644
--- a/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/ViewKeyMainFragment.java
+++ b/OpenPGP-Keychain/src/main/java/org/sufficientlysecure/keychain/ui/ViewKeyMainFragment.java
@@ -64,6 +64,7 @@ public class ViewKeyMainFragment extends Fragment implements
     private TextView mSecretKey;
     private BootstrapButton mActionEdit;
     private BootstrapButton mActionEncrypt;
+    private BootstrapButton mActionCertify;
 
     private ListView mUserIds;
     private ListView mKeys;
@@ -94,6 +95,7 @@ public class ViewKeyMainFragment extends Fragment implements
         mKeys = (ListView) view.findViewById(R.id.keys);
         mActionEdit = (BootstrapButton) view.findViewById(R.id.action_edit);
         mActionEncrypt = (BootstrapButton) view.findViewById(R.id.action_encrypt);
+        mActionCertify = (BootstrapButton) view.findViewById(R.id.action_certify);
 
         return view;
     }
@@ -130,6 +132,9 @@ public class ViewKeyMainFragment extends Fragment implements
                 mSecretKey.setTextColor(getResources().getColor(R.color.emphasis));
                 mSecretKey.setText(R.string.secret_key_yes);
 
+                // certify button
+                mActionCertify.setVisibility(View.GONE);
+
                 // edit button
                 mActionEdit.setVisibility(View.VISIBLE);
                 mActionEdit.setOnClickListener(new View.OnClickListener() {
@@ -143,6 +148,18 @@ public class ViewKeyMainFragment extends Fragment implements
             } else {
                 mSecretKey.setTextColor(Color.BLACK);
                 mSecretKey.setText(getResources().getString(R.string.secret_key_no));
+
+                // certify button
+                mActionCertify.setVisibility(View.VISIBLE);
+                mActionCertify.setOnClickListener(new View.OnClickListener() {
+                    public void onClick(View view) {
+                        certifyKey(KeychainContract.KeyRings.buildPublicKeyRingsByMasterKeyIdUri(
+                                Long.toString(masterKeyId)
+                        ));
+                    }
+                });
+
+                // edit button
                 mActionEdit.setVisibility(View.GONE);
             }
         }
diff --git a/OpenPGP-Keychain/src/main/res/layout/view_key_main_fragment.xml b/OpenPGP-Keychain/src/main/res/layout/view_key_main_fragment.xml
index fe5b417fb..644548183 100644
--- a/OpenPGP-Keychain/src/main/res/layout/view_key_main_fragment.xml
+++ b/OpenPGP-Keychain/src/main/res/layout/view_key_main_fragment.xml
@@ -251,6 +251,17 @@
             bootstrapbutton:bb_icon_left="fa-lock"
             bootstrapbutton:bb_type="info" />
 
+
+        <com.beardedhen.androidbootstrap.BootstrapButton
+            android:id="@+id/action_certify"
+            android:layout_width="match_parent"
+            android:layout_height="60dp"
+            android:padding="4dp"
+            android:layout_marginBottom="10dp"
+            android:text="@string/key_view_action_certify"
+            bootstrapbutton:bb_icon_left="fa-pencil"
+            bootstrapbutton:bb_type="info" />
+
     </LinearLayout>
 
 </ScrollView>
\ No newline at end of file